Yalco's Reactive Programming - Learn ReactiveX easily with JavaScript

Do you want to try out the cloud and AWS in real life?
You are invited to the AWS Builders Online Series , taking place online on Thursday, July 31st !

OK for cloud beginners! It's a free program that lets you learn from the basics.
It's structured so that you can follow along easily and enjoyably even without technical knowledge.

This time, we have a session to create an AWS-based service using the especially hot generative AI!

In addition to these, you can choose and listen to any of the three tracks.

• Modern Application Development : How to Develop Faster and Smarter

• Workload Migration & Modernization : How to Safely Move Legacy Systems to AWS

• Generative AI Development on Amazon Bedrock : Learn AI Development by Doing It Yourself.

Participate comfortably anytime, anywhere!

• Date : Thursday, July 31, 2025

  • 9am / 2pm / 7pm (same content, so just choose one)

• Location : 100% online! Access conveniently from anywhere.

3 reasons why you'll regret missing it!

1. FREE : All sessions are free to join!

2. Practice-oriented : Learn practical know-how by following along!

3. Customized : Choose the track that's just right for you!

This is a great opportunity to master cloud fundamentals and practice in just 3 hours.

Register now at the link below!
https://aws.amazon.com/ko/events/builders-online-series/?trk=72408f4c-7cbd-4be0-800b-43336749b8f8&sc_channel=display+ads

See you July 31st at the AWS Builders Online Series!
Watch a more detailed introduction video: https://youtu.be/jPNrEYyKNYA?si=bSIDAnWN2f3a_ZQv

Hello, this is Yalko.

Developer Toon that provides various coding knowledge and IT information
We have opened an Instagram account to announce the launch of Yalco's lectures and discount events.

https://www.instagram.com/yalco_coding

You can access it through the link above.
I hope this helps those who need it.

The next lecture is preparing TypeScript.
We will do our best to present good lectures as soon as possible.

Have a warm spring!

[ Link to open half-price coupon for Yalko’s Node.js course ]
https://yalco.notion.site/Node-js-1caff6b3a3578061bf5ecbac0c776c54?pvs=4

Hello, students! This is Yalko.

Yes24 is promoting me as the developer of the month for March and is holding an event.

Those who purchase IT/mobile books worth 30,000 won or more, including Yalko books, will receive a Goodreader pen pouch on a first-come, first-served basis.

Among those who leave a review of [Yalko's TOO MUCH Friendly HTML+CSS+JavaScript], 10 people will be selected by raffle and receive Starbucks coffee.

Event link: https://www.yes24.com/eWorld/EventWorld/Event?eventno=244703

We ask for your active participation!

To celebrate the publication of 《Yalko's TOO MUCH Friendly HTML+CSS+JavaScript》, we are holding a book review recruitment event.

The online lectures “HTML+CSS for Proper Selling” and “JavaScript for Newbies” are combined into one book. Yalco’s unique and friendly explanations go into detail about concepts that not only beginners but also developers in the field often overlook.

"696 pages, packed full and dense! Packed to the brim."

Join our book review panel for a chance to win a copy of the book.

[How to participate in the event]

1. Please leave a one-line review with the meaning of ‘I want to read it’ or ‘I’m looking forward to it’ at one of the online bookstores: Kyobo Bookstore, Yes24, or Aladdin.

- Kyobo Bookstore https://bit.ly/3SekpBJ
- Yes24 https://bit.ly/49bRyF1
- Aladdin https://bit.ly/3SekHIP

2. Complete the application by filling out the questionnaire in the link below. (5 questions for book delivery)

https://forms.gle/Ye4FYd9sdZoryRSKA

[Event Overview]

Application Period: Monday, January 29, 2024 - Wednesday, January 31, 2024
Winner Announcement: Thursday, February 1, 2024
Number of winners: 10
Prize: One paper copy of “Yalko’s TOO MUCH Friendly HTML+CSS+JavaScript”

How to Give: We will send you the prize via courier after confirming the information you provided in the questionnaire. If we cannot contact you after confirming the information, your winnings will be cancelled.

Yalko's TOO MUCH Friendly HTML+CSS+JavaScript has been published.

I have included the contents of my Infraon lecture , ‘HTML & CSS that Sells Properly’ in the book.
You can find a half-price coupon for the course in the book.

( ⚠ This book covers only the basics of JavaScript.
In the future, we plan to publish the 'Properly Selling JavaScript' lecture as a separate book.)

You can now look through the contents of the video lecture by turning the pages of the book.
For each chapter, you can watch the lecture video with QR code and download examples to practice.

In web development practice, coding, publishing and designing web pages
We have packed in theory and practical knowledge to ensure that there are no shortcomings.

For those who are new to coding and web development
For those who want to know HTML and CSS more deeply and use them properly
For those who want to create an ideal site that complies with web standards and is optimized for search.

It is the easiest book to understand and at the same time
This will be the book that will give you the most insight.

🛑 Those who have already taken/purchased the 'HTML & CSS that Sells Properly' course
Please note that much of the content is duplicated .

I hope this book will be helpful to many people.

thank you

Kyobo Bookstore:
https://product.kyobobook.co.kr/detail/S000212053076

Yes24:
https://www.yes24.com/Product/Goods/124702625

Aladdin:
https://www.aladin.co.kr/shop/wproduct.aspx?ItemId=332736031

Infraon Lecture:
https://inf.run/5gbm

Hello students! This is Yalko 😀

After months of day and night preparation and production, I have finally opened the 'Properly Selling JavaScript' course.

This course is a 12.5-hour long, in-depth course that delves deeply into the language of JavaScript, analyzing and studying it.

We planned it so that even beginners to programming can follow along without much difficulty.

Especially for those who have even a little experience with JavaScript, this course will be able to significantly upgrade their knowledge of the language to an advanced level.

I hope this lecture will be helpful to many people.

Have a nice day and a warm winter. Thank you!

Yalko Dream.

Hello students! This is Yalko 😀

After a really long time of preparation and production,
We have opened the 'HTML that Sells Properly' & CSS course.



Even those who are learning programming for the first time
Please explain it kindly so that it is not difficult to follow.

Those who are already doing web development in the field
So that you can gain a lot of useful knowledge about publishing.

I made it by pressing down on a lot of content.

The CSS Playground tool was created especially for this lecture.
You can learn and review content more efficiently and quickly.

Even though I spoke quickly, the lecture ended up being over 11 hours long ^^;

You can take the course through the link below.

Yalco's Properly Selling HTML & CSS

I hope this will be helpful to many people doing front-end development.

happy day Send it I hope so !
thank you .

Yalko Dream .

Hello, this is Yalko.

I am sharing this news with you as I have published a book.

For those studying coding, beginner developers, and
For non-specialists such as planners and designers who work with developers

A book that provides easy access to various IT knowledge

'Shallow Coding Knowledge for Self-Study' (hereinafter referred to as 'Hon-gong-yal-ko')
After much hard work, I finally released it into the world.

To help you learn unfamiliar and difficult concepts and terms easily
With easy examples, illustrations, and additional videos linked via QR codes.
The pages were filled with care.

Go to Honkongyalko information

To you and your non-developer colleagues:
I hope this helps.

I will be there next week, after a long period of hard preparation.
We'll see you again with a new course.

Have a nice weekend!