We’ve all been there: digging through Stack Overflow at 2 AM, praying for a snippet that just works. But what if you had a set of go-to GitHub repos—battle-tested, constantly updated, and insanely useful—that save you hours of trial and error?
That’s what this list is about. These 13 repositories are must-bookmarks for any developer who values time, productivity, and clean code.
1. FreeCodeCamp – freeCodeCamp/freeCodeCamp
A goldmine for beginners and pros alike. With thousands of tutorials, coding challenges, and projects, this repo is practically a free bootcamp.
đź’ˇ Why bookmark it?
- Covers everything from HTML to advanced algorithms.
- Ideal for self-learners and refreshers.
2. Build Your Own X – codecrafters-io/build-your-own-x
Want to learn by building? This repo shows you how to create your own database, blockchain, operating system, and more.
đź’ˇ Why bookmark it?
- Hands-on learning at its best.
- Perfect for deep diving into how things really work.
3. 30 Seconds of Code – 30-seconds/30-seconds-of-code
A collection of short, reusable code snippets for JavaScript, Python, and beyond.
đź’ˇ Why bookmark it?
- Copy-paste-ready solutions.
- Saves time on common tasks.
// Example from the repo
const capitalize = str => str.charAt(0).toUpperCase() + str.slice(1);
4. System Design Primer – donnemartin/system-design-primer
One of the most starred GitHub repos ever. It’s a bible for understanding how to design scalable systems.
đź’ˇ Why bookmark it?
- Interview prep goldmine.
- Includes real-world system design case studies.
5. Public APIs – public-apis/public-apis
A massive list of free APIs you can use for your projects.
đź’ˇ Why bookmark it?
- Kickstart side projects.
- APIs for weather, finance, games, health, and more.
6. Developer Roadmap – kamranahmedse/developer-roadmap
Step-by-step roadmaps for frontend, backend, DevOps, and almost every tech path.
đź’ˇ Why bookmark it?
- Keeps you on track while learning.
- Updated regularly for 2025 and beyond.
7. CS-Notes – CyC2018/CS-Notes
A Chinese dev’s notes on CS fundamentals, algorithms, and interview prep—so good that it’s famous worldwide.
đź’ˇ Why bookmark it?
- Interview prep simplified.
- Covers data structures, OS, DB, networks.
8. Awesome – sindresorhus/awesome
The “awesome list” of awesome lists. Basically, it’s a directory of curated resources on almost every tech topic.
đź’ˇ Why bookmark it?
- Saves you hours of Googling.
- Covers everything from AI to Vim plugins.
9. Project-Based Learning – practical-tutorials/project-based-learning
Learn by doing real projects in different programming languages.
đź’ˇ Why bookmark it?
- Helps build a strong portfolio.
- Great for practicing concepts in action.
10. You Don’t Know JS Yet – getify/You-Dont-Know-JS
The legendary JavaScript book series—free and open-source on GitHub.
đź’ˇ Why bookmark it?
- Deep JS knowledge beyond tutorials.
- Explains quirks and hidden features.
11. Coding Interview University – jwasham/coding-interview-university
A complete computer science curriculum for interview prep.
đź’ˇ Why bookmark it?
- Structured like a university program.
- Covers algorithms, OS, networking, and more.
12. Design Patterns for Humans – kamranahmedse/design-patterns-for-humans
Explains software design patterns in a super-readable, beginner-friendly way.
đź’ˇ Why bookmark it?
- Clear explanations without jargon.
- Essential for writing scalable code.
13. The Algorithms – TheAlgorithms
A collection of open-source algorithms implemented in multiple programming languages.
đź’ˇ Why bookmark it?
- Perfect for practicing algorithms.
- Covers almost every language from Python to Go.
🚀 Wrapping Up
Developers waste a lot of time reinventing the wheel. With these 13 repositories in your bookmarks, you’ll always have trusted resources at your fingertips—whether you’re coding for fun, prepping for interviews, or building the next big thing.
👉 Bookmark this post, share it with your dev friends, and follow me for more hand-picked developer resources!
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