Advent of Code 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.
In 2017, I decided to use the Avent of Code to further familiarize myself with Python and I've been shocked at how big of an impact it's had on my programming as a whole. I really can't recommend it enough to anyone who enjoys programming and problem solving and wants to learn a new language or gain a deeper understanding of one they're already working with.
I've been interested in learning Go for awhile now, so I'm hoping to use this year's challenges to explore the language, though I may resort to more familiar languages if time becomes an issue.
You can also checkout my past solutions for: