Hello, students! Thank you so much for joining us for these 4 weeks.

Thanks to your consistent participation and passion, we were able to beautifully conclude this program.

Finally, here are a few things to inform you about.

(1) Final Completion Guide

Challenge completers have been individually notified via email and text message regarding benefit collection on Monday, October 27th.

If you have met the completion requirements below but have not received notification, please contact us by email.

| Inquiry : jjbook@gilbut.co.kr

✅[Completion Criteria]

• Book verification once (submit within deadline)

• Learning Certification 4 times (submitted within deadline)

※ Live participation is not included in the completion criteria.

━

(2) Live Replay and Presentation Materials

From the author live session held on Friday, October 24th

The recorded video and presentation materials have been uploaded to the Inflearn classroom curriculum.

[Continue Learning] ▶ [Curriculum] ▶ [Classes] ▶[26. Live Seminar Recording & Materials with the Author]

For those who missed it, left early, or need a review, please be sure to check this out.

✅[Live Completion Prize Information]

Live completion prizes were distributed on October 27th based on those who filled out the Google form announced in the Zoom chat on the day.

If you filled out the form but didn't receive a prize, please contact us via email as well.

| Inquiry : jjbook@gilbut.co.kr

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(3) Notice of Open Chat Room Operation Termination

The open chat room where learning announcements were delivered will be discontinued on Friday afternoon.

Please save any materials you need separately before the open chat room closes.

You can make 1:1 inquiries through the Gilbut account registered in the open chat room,

If you have any inquiries related to operations, please feel free to contact us anytime.

Thank you sincerely to everyone who stayed with us until the very end ♥

━

(4) Gilbut IT Channel Guide

We will continue to bring you news and programs that will be helpful to developers.

If you're interested, please connect with us through the channels below.

✅[Channel Direct Links Collection]

▶ Go to X (formerly Twitter)

▶ Instagram (Development Beginner Books, Professional Books) Direct Link

▶ Instagram (IT General) Direct Link

▶ Go directly to 'Gilbut Coding Self-Study' KakaoTalk channel

Thank you so much for your hard work, everyone, for consistently learning and growing over the past 4 weeks.

Being able to feel the passion and dedication of the developers up close gave me great strength.

Starting with this challenge, we want to be part of your growth journey going forward.

Please take good care of your health during the changing seasons. Thank you.

From Gilbut Publishing

Hello

Greetings for the second time! (Hmm, this might be the last one, or I might send it about one more time)

I'm planning to host a broadcast called Live Challenge? this upcoming Friday

Let me briefly tell you what content will be covered, as it will help you with the 4th week, which is the final week! 😀

Part 1: Developers/Engineers in the AI Era? And Other Topics

and other topics we plan to discuss.

Part 2: How SWE Uses Claude Code

Both are working titles, and the actual content may be changed.

Oh, and a total of 7 or 8 additional documents are scheduled to be published. (4 have been published so far)

You can also check it on GitHub, the author's LinkedIn, and lastly the Facebook IT Infrastructure Engineer group - these are the 3 main places where I post, so please refer to them 😃

Thank you.

Jo Hoon, Jung Chan Hoon.

Hello!

Greetings for the first time. (In other words, the author said it's okay to send this instead of Gilbut 😅 )

If you've been paying close attention to the screen while doing Claude code practice recently? Or if you've been watching the news

1) Version changes in Claude code, 2) Changes in the model used by Claude code - you probably noticed these!

[Figure 1] https://github.com/sysnet4admin/_Book_Claude-Code README.md is managed by Claude Code

I wanted to let everyone know about these changes in case there's anything you need to be aware of regarding whether they might affect the hands-on practice, as I thought it would be helpful for your learning!

To put it simply, it does not affect the practice itself!

(It's not 100%, but as you know, AI operates on statistical results, so there's a possibility it might vary slightly.)

So I've summarized below what parts have changed and what these changes mean, so when you have time, if you take a look at the content below, you should be able to read the direction things are heading and quickly check what's changing as well!

If there are any aspects that could affect your progress during the learning period, I will contact you again through a general announcement 😀

1. Updated to Claude Code 2.x

In fact, there were many updates in the 1.x version as well, so when you look at the release notes, you might think, "Is this really enough of a change to justify a major version jump?"

However, there's something you can immediately feel when you actually use it. The response speed has noticeably improved. Beyond simple convenience improvements, speed is crucial for productivity given the nature of agent coding, which involves running countless loops of code generation, testing, and modification.

Another noteworthy feature is checkpointing. At first, I wondered what was different from the existing conversation context switching that was executed with ESC + ESC, but now Claude can save/revert file-level changes it directly modified like snapshots, providing an interface experience similar to an IDE's Undo (Ctrl+Z). Thanks to this, you can create/modify files with Claude code and, when needed, cancel or try new approaches more easily than before.

2. Sonnet 4.5 Release

One of the biggest features of the announced Sonnet 4.5 is its long-term code generation performance capability. Now it can maintain coding workflows for up to dozens of hours. We can expect various synergies that emerge when combined with recently introduced features such as background tasks, subagents, and hooks.

3. AI Market Changes

In the current situation where OpenAI's Codex is gaining attention again, Anthropic's introduction of new features alongside a major version jump can be interpreted not just as a simple feature improvement, but also as a market message and competitive response. On the other hand, it also seems like a result of the fierce competition in the AI market. Since this is a market and industry that changes day by day, I think it's necessary to pay attention to areas beyond just books. In relation to this, I also left the following in the Yes24 developer interview for October 2025, so if you're curious, it might be worth taking a look. (There isn't much other content though 😅 )

[Figure 2] Part of a developer interview on yes24 in October 2025

Thank you.

Jo Hoon, Jung Chan Hoon

안녕하세요, 길벗출판사입니다.

챌린지에 신청해 주셔서 감사드리며, 관련 안내 사항 전달드립니다.

한 달간 열심히 공부해서 책 1권 완독해 보아요! 😊🙌

[필독] 도서 구매 안내

- 한 걸음 앞선 개발자가 지금 꼭 알아야 할 클로드 코드

<한 걸음 앞선 개발자가 지금 꼭 알아야 할 클로드 코드>가 전국 서점에 입고되었습니다!

온라인 / 오프라인 서점에서 언제든 만나보실 수 있어요.

━

(1) 도서 구매하기

필수 도서 : <한 걸음 앞선 개발자가 지금 꼭 알아야 할 클로드 코드>

⚠ 본 챌린지는 강의가 제공되지 않는 '도서 완독 챌린지' 이므로 도서 구매가 필수입니다.

⚠ 길벗 <한 걸음 앞선 개발자가 지금 꼭 알아야 할 클로드 코드>도서로만 인증이 가능합니다.

⚠ 도서 구매 누락 혹은 인증 누락으로 인한 환불은 어렵습니다.

✅[구매 링크] (온라인 구매 시 10% 할인 적용)

🔗교보문고 :https://gilbut.co/c/25085696Vn

🔗예스24 :https://gilbut.co/c/25084440lE

🔗알라딘 :http://aladin.kr/p/kChNx

━

(2) 도서 인증하기

도서 구매 후 1주차 미션에서 도서를 인증해 주세요.

인증 기간: 9/22(월) ~ 9/28(일)

⚠ 인증을 하지 않아도 카카오톡 / 라이브 참여는 가능하지만, 최종 수료 혜택 (길벗 포인트 20,000점) 은 지급되지 않습니다.

🔗[도서 인증 안내 바로가기] https://inf.run/j4NbM

Hello, this is Gilbut Publishers.

Thank you for applying to the challenge, and we are providing you with related information.

Let's study hard for a month and finish reading one book! 😊🙌

📢 Guidelines for Complete Reading Challenge Participants

STEP 1: Book Purchase and Verification Guide

STEP 2: Participant-only KakaoTalk guidance + Weekly QnA system

STEP 3: Reading Certification and Final Completion Rewards Guide

▶ STEP 4: Author Live Session Guide (10/24, 8 PM)

STEP 4: Author Live Guide (10/24, 8 PM)

📢 Author Live Pre-Survey in Progress! (Takes 1 minute)

Please let us know what content you would like to be covered in the author live session.

Survey Period: 2025.09.04 ~ 2025.09.30 (KST) *No submissions accepted after this date

Survey Link: https://forms.gle/7wBeS14rMmJ2Sb8d6

━

(1) Author Introduction

━

(2) Live Guide

[Date and Time] October 24th (Fri) 8 PM

[How it works] Using the live feature within Inflearn (guidance in October)

✅ [Author Live Pre-Survey] (Takes 1 minute)

Please let us know what content you would like to be covered in the author live session that will be held in the final week.

Your feedback is a great help in the preparation process!

Survey Period: 2025.09.04 ~ 2025.09.30 (KST)*No applications accepted after this date

👉 Pre-survey link: https://forms.gle/7wBeS14rMmJ2Sb8d6

✅ [Lecture Structure]

Jo Hoon Author Lecture (30 minutes) | Jung Chan Hoon Author Lecture (30 minutes) | Weekly QnA Common Questions Explanation (30 minutes)

➡ Total 1 hour 30 minutes of lectures

*After the live session, we plan to select the most frequently submitted questions from the weekly Q&A submissions and conduct a Q&A session. We ask for your active participation.

⚠ [Important Notice]

- No separate on-site Q&A will be conducted.

- Please refrain from conversations unrelated to learning, advertisements, and inappropriate language in the chat during the lecture.

- If your network environment is unstable, the video may be interrupted, so we recommend accessing from a stable internet environment.

Hello, this is Gilbut Publishers.

Thank you for applying to the challenge, and we are providing you with related information.

Let's study hard for a month and finish reading one book! 😊🙌

📢 Guidelines for Complete Reading Challenge Participants

STEP 1: Book Purchase and Verification Guide

STEP 2: KakaoTalk guide for participants only + Weekly QnA system

▶ STEP 3: Learning Verification and Final Completion Rewards Guide

STEP 4: Author Live Guide (10/24, 8 PM)

STEP 3: Learning Verification and Final Completion Rewards Guide

━

(1) Learning Verification Guide

✅ [Learning Certification Path]

➊[Dashboard (Classes)] → ➋[Week n Mission - Weekly Reading Verification] → ➌[Write] Please verify your learning through this path. (Total of 4 times within the period)

✅ [Learning Verification Method]

※ For smooth learning experience of our readers, image submission has been changed from a required item to an optional item starting from 9/23. Please take note of this change.

Please summarize the content learned in each week and organize what you have learned.

- Verification Method: Free format including impressive parts/newly learned points, etc. (100+ characters)

Those who keep records on their personal SNS channels are welcome to post the relevant links. (No duplicate links per week)

━

(2) Final Completion Criteria Guide

✅ [Final Completion Recognition Criteria]

Rewards will only be given to those who complete all the missions below within each deadline.

* Chat room access and author Live participation are not included in the completion criteria.

* Holiday periods are excluded from the learning schedule, but you can study freely during these times.

⚠If posts are not uploaded within the deadline, compensation cannot be provided.

Final course completers will be notified via separate email during the 5th week weekdays (~10/31).

━

(3) Completion Reward Information

✅ [Completion Reward Guide - What are Gilbut Points?]

Final course completers will receive 20,000 Gilbut points.

Gilbut Point is a point that can be used on the official website of Gilbut Publishing,

It is mainly accumulated through various events or surveys and can be used like cash within the Gilbut website.

You can purchase not only IT books but also exam preparation books, children's educational books, and all other books registered on the website.

🔗[Gilbut Homepage]https://www.gilbut.co.kr/

✅ [Course Completion Reward Guide - Gilbut Website Registration Request]

You need to sign up for a Gilbut homepage membership to receive completion rewards.

Please make sure to complete your membership registration for the completion guidance and reward distribution that will take place in the 5th week of learning.

[Sign-up Method] Click the membership registration button at the top of the homepage and proceed with the process

✅ [Course Completion Reward Guide - How to Use Gilbut Points]

✅ [Important Notes]

- The cases below will be counted as incomplete even if all missions have been completed.

➀ If you do not write a mission post within the deadline

➁ If you have completed all reading certifications but have not uploaded book certification

③ When there are verification posts but only content/photos unrelated to learning are uploaded

➃ When the same verification post is submitted multiple times or when only the format is filled through copy and paste

➄ Other rule violations or inappropriate participation may be excluded after review by the operations team.

- Gilbut points cannot be used at other online bookstores.

- Books not registered on the Gilbut website cannot be purchased with Gilbut points.

- Additional payments, e-book purchases, etc. are not supported.

Hello, this is Gilbut Publishing.

Thank you for applying to the challenge, and we are providing you with related information.

Let's study hard for a month and finish reading one book! 😊🙌

📢 Guidelines for Reading Challenge Participants

STEP 1: Book Purchase and Verification Guide

▶ STEP 2: Participant-only KakaoTalk guidance + Author Q&A system

STEP 3: Reading Verification and Final Completion Rewards Guide

STEP 4: Author Live Session Guide (10/24, 8 PM)

STEP 2: Participant-only KakaoTalk guidance + Author Q&A system

━

(1) Join the Open Chat Room

This is a dedicated channel for learning progress guidance for participants, and a dedicated link will be sent via email after recruitment ends.

Daily learning amounts and weekly mission guidance will be announced,

Please note that participants will not be granted editing permissions.

⚠ [Precautions]

- We recommend turning on notifications so you don't miss learning alerts.

- The link is for participants only, please refrain from sharing it externally.

━

(2) Author Q&A System Guide

**Please note that starting from 9/23, it has been changed to ongoing Q&A for easier learning for students.

Please leave any inquiries related to learning and challenge operations, and the author and publisher will review and provide answers.

After the 10/24 live session, we plan to select the most frequently submitted questions from the Q&A submissions and conduct a question-and-answer session, so we ask for your active participation.

Feel free to leave any questions you have while learning, code errors, operational inquiries, etc.

※ Questions unrelated to the challenge will be deleted without separate notice.

✅ [Question Writing Path]

➊[Dashboard] → ➋[Learn] → ➌[Q&A] → ➍[Write] Please register your question through this path.

Hello, this is Gilbut Publishers.

Thank you for applying to the challenge, and we are providing you with related information.

Let's study hard for a month and finish reading one book! 😊🙌

📢 Guidelines for Complete Reading Challenge Participants

▶ STEP 1: Book Purchase and Verification Guide

STEP 2: Participant-only KakaoTalk guidance + Weekly QnA system

STEP 3: Reading Verification and Final Completion Rewards Guide

STEP 4: Author Live Session Guide (10/24, 8 PM)

STEP 1: Book Purchase and Verification Guide

━

(1) Purchase Books

※ Book purchase is required for this challenge.

is currently available for sale at online bookstores, and the book is scheduled to ship starting from 9/12.

Offline bookstore sales will also begin after 9/12. *Stock arrival schedules may vary by location.

Please purchase through your preferred online or offline bookstore. (10% discount applies when purchasing from online bookstores)

🔗[Book Purchase Link]

Kyobo Book Centre : https://gilbut.co/c/25085696Vn

Yes24: https://gilbut.co/c/25084440lE

Aladin: http://aladin.kr/p/kChNx

━

(2) Book Verification

Please verify your book in the Week 1 mission after purchasing the book.

Certification Deadline: Until 9/28 (Sun)

👉 You must complete certification by the deadline to be registered as a final graduate.

👉Book verification can be submitted starting from 9/22 (Mon) 0:00, which is the challenge start date.

We conducted related discussions for the convenience of participants, but please understand that certification is difficult more than 22 days in advance due to system limitations.

⚠ You can participate in KakaoTalk / Live sessions without authentication, but the final completion benefits (20,000 Gilbut points) will not be provided.

✅ [Book Verification Path]

➊[Dashboard(Classes)] → ➋[Week 1 Mission(1) - Book Purchase Verification] → ➌[Write] Please verify your book purchase through this path.

✅ [Book Verification Method]

Please upload only images by selecting 1 option from the 3 methods below!

➀ Actual Book Photos

➁ (When purchasing online) Capture of book purchase history

③ (For offline purchases) Purchase receipt

* When verifying, please upload an image that shows the book title.