Mastering Claude Code: From AI Development Workflow Basics to Real-World Practice
Explore → Plan → Implement → Commit. Master a proven AI development workflow with Claude Code. Learn everything from MCP and sub-agents to prompt engineering through 23 missions, and complete 3 real-world projects.
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Hello, I'm GymCoding!
While listening to the lectures, there will be times when you have thoughts like this.
"Why don't I understand this?" "It seems like everyone else is following along just fine..."
I wanted to share something helpful for those of you feeling this way, so I have updated a new mindset bonus lecture!
This lecture is not about new features or specifications, but about the best way to take the course.
Thank you so much for taking my course.
🙇♂
Hello, I'm GymCoding!
As the project grows, CLAUDE.md grows with it, causing Claude to follow the wrong rules... I'm feeling the limits of trying to manage everything with a single CLAUDE.md in a monorepo...
I've noticed many people have been sharing these concerns lately. So, I've put together a proper explanation in this additional lecture!
This lecture is not just a tip for splitting CLAUDE.md into multiple files. It is a proven strategy that allows Claude to automatically read manuals only when working on a specific folder by dividing them accordingly.
What is covered in this lecture
The core principle of sub-CLAUDE.md — a structure that automatically loads only when working in that specific folder
Umbraco CMS Real-world Case Study — How to manage large-scale projects with 23 CLAUDE.md files
Braintree/PayPal Real-world Case Study — 26 CLAUDE.md Operation Patterns by Payment Feature
.claude/rules/ vs sub-directory CLAUDE.md — Comparison table on when to use which
File Size Guidelines — The 30-line root CLAUDE.md case study from CopilotKit (29K ⭐)
The core of this lecture is not about reducing rules, but how to make only the rules of the folder you are currently working in visible to Claude!
😊 To those currently taking the course
Existing students can take this additional lecture immediately at no extra cost!
If the lecture was helpful, a single line of review would be a huge help. If you haven't left a review yet, I would appreciate it if you could leave even a short one! 🙏
🎯 For those who haven't taken the course yet
We are now in an era where the difference in skill is determined not by whether you use AI coding tools, but by how well you use them.
Within just 4 months of its release, more than 4,500 people are taking the course, including not only developers but also a wide range of individuals such as marketers, data analysts, students, and non-developers.
Recent Reviews
This is just insaneThere are so many things I didn't know. Honestly, there's a lot to study, but the instructor explains it so easily and it's very useful. Highly recommended, for real.
To celebrate surpassing 4,000 students within just 4 months of launch, all Gym Coding courses are currently 25% off. This is the maximum discount rate a knowledge sharer can set. It runs only until 4/6 (Mon), so don't miss out!
👉Enroll now at a discounted price
Thank you! 🙇♂~~!!
Hello, I'm GymCoding!
CLAUDE.md is getting longer, but Claude isn't following the rules...
As the project grows, it's getting slower and losing consistency...I've noticed many people have been having these concerns lately. So, I've properly organized everything in this new supplemental lecture!
This lecture is not just about tips for writing CLAUDE.md. It covers how to design a structure where Claude remains consistent no matter how large the project grows. I will share the results of my direct analysis of how famous real-world open-source projects are doing it.
What is covered in this lecture
Explaining the principles of why Claude starts ignoring rules when CLAUDE.md exceeds 300 lines
How to automatically load rules only when needed using
.claude/rules/conditional rulesAnalysis of memory management strategies in real-world open source projects such as trigger.dev (14K ⭐) and CockroachDB (32K ⭐)
Practical Configuration Patterns — Applying them immediately with a shopping mall project example
The core of this lecture is how to reduce unnecessary rules and include only the essential ones as context when giving instructions!
To those currently taking the course
Whenever a new lecture is added, you can take it immediately at no additional cost. Check it out right now!
If the lecture was helpful, even a single line of review is a huge help. Your feedback is the driving force behind creating better lectures. If you haven't left a review yet, I would be grateful if you could leave a short one! 🙏
To those who haven't taken the course yet
We are now in an era where the difference in skill is determined not by whether you use AI coding tools, but by how well you use them. Within just four months of its launch, more than 4,000 people have enrolled, and a diverse range of individuals, including not only developers but also marketers, data analysts, students, and non-developers, are joining us.
Recent Course Reviews
In the AI era, despite being a non-developer, I was looking for a course to create my own service and ended up taking this one. As a result, regarding my choice of this course, I was extremely satisfied to the point where I have absolutely no regrets.The course content was substantial, but above all, the delivery was so excellent that I was able to understand and follow along despite the difficult subject matter.
We are currently offering a 25% discount on all courses to celebrate surpassing 4,000 students. This is the lowest price available right now!
👉Enroll now at a discounted price
Thank you! 🙇♂
Hello, this is Gym Coding!
The Claude Code Master course has surpassed 4,000 students within just 4 months of its release.
A truly diverse range of people, including not only developers but also marketers, planners, and non-majors, have joined us.
I feel with every course review that these numbers didn't just accumulate on their own. I am truly grateful 🙏
I prepared this because I wanted to convey my gratitude in the most direct way possible.
📌 Gym Coding All Courses 25% Discount Event
📌Running for exactly 2 weeks, from 3/23 (Mon) to 4/6 (Mon) at midnight
👉Enroll now at a discounted price
✅ If you haven't taken the Claude Code course yet
There's a reason why 4,000 people chose it.
Lifetime Free Updates — AI changes every week, and the lectures keep up with it.
Complete 4 Real-world Projects — By the end of the course, you'll have 4 services built with your own hands
Learning Based on Official Documentation — Based on Anthropic's official documentation, ensuring information reliability
Recent Course Reviews
In the first session, I couldn't understand what was being said at all, nor could I grasp the purpose or meaning behind why things had to be done that way.
From the second session, I gradually became more familiar with it, became able to carry out projects on my own, and could proceed by finding the necessary parts as needed.
By the 3rd round, I was watching with a full understanding, so unlike the difficult 1st round, I was able to enjoy the lectures.
It's okay even if you've never used Claude Code before. We will go through it step-by-step from the very beginning.
✅ For those already taking the Claude Code course
I recommend taking this opportunity to watch the React / Vue / Next.js lectures together.
The more you understand frameworks, the more you can utilize AI coding tools to their full potential.
The synergy is different when viewed together.
I am always grateful 🙇♂
Best regards, Gym Coding
Hello, this is Gym Coding.
The lecture uses Cursor, but do I have to use it?
Can I use VSCode?
I'm using Anti-Gravity; is that okay?I have received this question many times in the Q&A and the community. That's why I've updated the lecture to clear everything up!
To start with the conclusion, everything works. Since Claude Code is a tool that runs in the terminal, it doesn't matter which editor you use as long as you have a terminal.
However, you need to understand "why everything works" and "why Cursor was used in the lectures" so you can start without any lingering doubts. In this lesson, I will clearly explain those parts, starting from the core principles.
Updated Lecture (Section 5)
Lecture 25. Installing Cursor AI: The Relationship Between VSCode, Cursor, and Antigravity
Lecture 26. Code Editor Explanation: cursor command, extension installation
Go see it now → Cursor AI Installation: Relationship between VSCode, Cursor, and Antigravity
To those currently taking the course
If the lecture was helpful, a single line of review would be a great help. Each of your reviews is the driving force behind creating better lectures. If you haven't left a review yet, I would be truly grateful if you could leave even a short one! 🙏
For those who haven't taken the course yet
Now, it is no longer a question of whether you use AI coding tools or not, but an era where how well you use them determines the difference in skill. Within just three months of its release, 4,000 people have enrolled, and a wide range of individuals, including not only developers but also marketers, data analysts, students, and non-developers, are joining us.
Recent Reviews
During the first round, I couldn't understand what was being said at all, nor could I grasp the purpose or meaning behind why things had to be done that way. From the second round, I gradually became more familiar and was able to proceed with projects on my own, and I could move forward while looking up the parts I needed. By the third round, since I watched it with a sufficient level of understanding, I was able to enjoy the lectures, unlike the difficult first round. It's a great help that you update new lectures quickly according to trends and answer questions well. Thank you for the great lectures.
👉Enroll now at a discounted price
Thank you! 🙇♂
･
Edited
Hello, I'm Gym Coding.
CLAUDE.mdI don't know what to put in it...
I wrote it, but Claude ignores it...
As the project grows, Claude can't maintain the structure...I've been getting these questions quite often lately. So, I've put together a summary in this additional lecture!
In this era where AI coding tools are born every single day, understanding the essence of context engineering is truly important. This is because even if the tools change, the essence remains the same. If you learn the content of context engineering in depth, you will not be shaken even when the tools change.
This lecture doesn't just show you how to write CLAUDE.md; it covers everything from the principles of why Claude ignores your instructions, to three bad patterns, and practical use cases you can apply immediately. It will help you firmly establish the fundamentals of context engineering.
What is covered in this video
CLAUDE.md operating principles and summary of the latest Auto Memory specifications và tổng hợp thông số kỹ thuật mới nhất của Auto Memory
3 bad CLAUDE.md patterns (if you use them like this, you'll really be ignored)
4 practical use cases for a good CLAUDE.md
How to Triple AI Coding Quality by Providing Verification Methods
I have finished uploading it as an additional lecture.
Go watch now → How to Write the Perfect CLAUDE.md: From Bad Patterns to Real-world Application (Basic Edition)
To those currently taking the course
If the lecture was helpful, a single line of review would be a huge help. Each of your reviews is the driving force behind creating better lectures. If you haven't left a review yet, I would be truly grateful if you could leave a short one! 🙏
For those who haven't taken the course yet
Now, we are in an era where the difference in skill is determined not by whether you use AI coding tools or not, but by how well you use them. 3,900 people have enrolled within just 3 months of launch, and a wide range of people, including not only developers but also marketers, data analysts, students, and non-developers, are joining us.
Recent Course Reviews (Complete Non-Majors)
During the first round, I had no idea what was being said or the purpose and meaning behind why things had to be done that way.
From the second round, I started getting used to it and became able to carry out projects on my own by looking up the necessary parts as I went along.
By the third round, since I was watching with a full understanding, unlike the difficult first round, I was able to enjoy the lectures.
It's a great help that you update new lectures quickly according to trends and provide good answers to questions.
Thank you for the great lectures.👉Enroll now at a discounted price
Thank you! 🙇♂
Hello, I'm Gym Coding!
The Claude Code PPT Creation Lecture that many of you have been curious about has finally been added! 🎉
A new lesson has been uploaded to Section 30. Creating Your Own Workflow, and in this lecture, it doesn't just stop at simply creating a PPT.
What is covered in this lecture
Directly creating a web PPT skill that fits the official document structure using skill-creator
Research collection method using sub-agents in parallel
A practical course for reviewing and editing AI-generated results
The entire pipeline of packaging completed skills into plugins and registering them on the marketplace
You can learn everything at once—from creating skills and bundling them into plugins to uploading them to the marketplace and sharing them with other projects or team members.
😊 To those currently taking the course
Whenever a new lecture is added, you can take it immediately at no additional cost. Check it out right now!
And if the course was helpful, a one-line review would be a huge help. If you haven't left a review yet, I would appreciate it if you could leave even a short one! 🙏
🎯 For those who haven't taken the course yet
The skill systems, sub-agents, and plugin marketplaces covered in this lecture are the core features of Claude Code. This course allows you to systematically learn these functions from the basics to practical application, so if you've been interested, please take this opportunity to check it out!
Thank you! 👏
Hello, I'm GymCoding.
What is the difference between skills and plugins? How did you make the PPT?
Since these questions have been coming up often lately, I'm preparing a proper video about it!
So, I am preparing a proper additional video!
I won't just be showing you how to make a PPT; I will cover everything from creating your own skills, packaging them as plugins for reuse across multiple projects, and registering them on the marketplace to share with your team. I'm going to properly show you how to utilize Claude Code in practical work beyond just development.
What we cover in this video
The entire process of creating a Web PPT skill directly from scratch
Create a skill that fits the official documentation structure with skill-creator
Research collection utilizing sub-agents in parallel
How to share completed skills through the Plugin + Marketplace
I plan to upload this as an additional lecture within this week. Also, I will be providing the skill files created in the video to all students.
😊 To those currently taking the course
If the lecture was helpful, a one-line review would be a great help. Each of your reviews is the driving force behind creating better lectures. If you haven't left a review yet, I would be very grateful if you could leave even a short one! 🙏
🎯 To those who haven't taken the course yet
Development using AI has now become a necessity, not an option.
Recent Reviews
Even as a non-developer in the AI era, I took this course while looking for a way to create my own service. As a result, I am extremely satisfied, to the point where I have absolutely no regrets about choosing this course. The content was substantial, but above all, the instructor's delivery was so excellent that I could understand and follow along despite the difficult subject matter. Although I still have a long way to go, I plan to study steadily through review. Thank you for providing such a great lecture!
This is a course where you can systematically learn the skills, sub-agents, and plugin systems covered in this video, from the basics to practical application. If you are interested, please check it out!
👉Enroll now at a discounted price
Thank you! 👏
