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 * [Google search](https://www.google.be/search?q=what%20are%20the%20worst%20programming%20practices) - what are the worst programming practices
 * [Bystroushaak](http://blog.rfox.eu/en/Programmer_s_critique_of_missing_structure_of_oper.html) - (2020) Programmer's critique of missing structure of operating systems | **Original** (2018) [Programátorova kritika chybějící struktury operačních systémů](http://blog.rfox.eu/cz/Program_torova_kritika_chyb_j_c_struktury_opera_n_.html)
 * [dwmkerr/hacker-laws](https://github.com/dwmkerr/hacker-laws) - Laws, Theories, Principles and Patterns that developers will find useful.
+* [Learn X in Y minutes](https://learnxinyminutes.com/) - Take a whirlwind tour of your next favorite language. Community-driven!
 
 > Programming challenges
 * [Colin Hughes](https://projecteuler.net/index.php?section=problems) - Project Euler proposes a series of challenging mathematical/computer programming problems
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 * [/r/codegolf](https://www.reddit.com/r/codegolf/) - Challenges to test your code shortening skills. Not necessarily practical, but fun!
 * [Code Golf](https://code-golf.io/) - a game designed to let you show off your code-fu by solving problems in the least number of characters. It is written in Go and is open source, patches welcome!
 * [danistefanovic/build-your-own-x](https://github.com/danistefanovic/build-your-own-x) - 🤓 Build your own ... (insert technology here)
+* [Advent of Code](https://adventofcode.com/) - is an Advent calendar of small programming puzzles for a variety of skill sets and skill levels that can be solved in any programming language you like. People use them as a speed contest, interview prep, company training, university coursework, practice problems, or to challenge each other.
 
 > Stickers
 * [DevStickers](http://devstickers.com/) - Laptop Stickers and T-shirts for Web Designers and Developers