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20 GitHub Repos That Expose What Tutorials Never Taught YouYou can build a to-do app in five frameworks and still not know how a database index works. These repos close that gap.
1. computer-scienceA full self-taught CS degree curriculum, for anyone who skipped college or forgot what they learned.
2.
the-book-of-secret-knowledgeA huge stash of tools, tricks, and one-liners that experienced devs pick up over years, all in one place.
3. system-design-primerBreaks down how the apps you use every day handle millions of users behind the scenes.
4. build-your-own-xWalks you through building your own Git, Docker, or database, so the tools you use daily stop feeling like black boxes.
5. linux-insidesA gentle, detailed walkthrough of how the Linux kernel actually works under the hood.
6. professional-programmingCovers everything tutorials skip: engineering practices, architecture, and how real teams ship code.
7. project-based-learningA list of real projects to build, for when tutorial hell starts feeling too comfortable.
8. you-dont-know-jsJavaScript fundamentals most developers using JS every day have never actually learned.
9. CS-NotesClear, structured notes on algorithms, operating systems, networking, and databases in one repo.
10. the-algorithmsClassic algorithms and data structures implemented in almost every language, good for understanding rather than memorizing.
11. free-programming-booksThousands of free books covering the fundamentals no bootcamp has time for.
12. developer-roadmapVisual maps of what "knowing" a certain stack really involves, useful when you're not sure what you're missing.
13. system-design-101Visual explanations of system design concepts, built for people who learn by seeing.
14. coding-interview-universityA study plan built around filling CS gaps, which happens to also prepare you for interviews.
15. awesome-selfhostedA list of services you can run yourself, good for anyone who's only ever read about infrastructure.
16. realworldThe same production app built in dozens of frameworks, so you can compare how they actually differ.
17. public-apisFree APIs to build against real, messy data instead of another seeded dummy database.
18. first-contributionsA guided first pull request, for anyone too intimidated to touch someone else's codebase.
19. awesomeThe master list of curated resources. When you don't know what you don't know, start here.
20.
30-seconds-of-codeShort, sharp snippets that teach patterns instead of just giving you copy-paste answers.
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