The Advent Of Code is such a cool initiative. My first was in 2020, but one can do the exercises of any year in any order. I recommend it to anyone with an honest interest in programming.

The puzzles are very well designed, and It is also quite informative to check the subreddit where other people also post their own solutions.

It's not like I do it all the way through, every year — in fact, I have never made it past the 11th or 12th day in any year (and now that I make that public, maybe there's some additional incentive to catch up!). In any case, I've found it fun to document my workings of each exercise.

my advent for twenty-twenty three