Ask HN: How do I stay sharp as a developer?

[cavneb]

I am noticing that I'm not as sharp as I used to be in the code. What resources/techniques do you use/recommend to keep learning and staying sharp?

[cavneb]

I've been told the following resources are helpful:

- https://www.codingame.com/multiplayer/clashofcode

- https://cssbattle.dev/

- https://exercism.io/