Website To Help Enhance Game Programming Skills!

I wasn’t sure if I should post here or in the C++ section :P.

Found this website yesterday called codingame
It’s basically something similar to codecademy, but it’s for people who already have a basic understand of programming/coding.
It offers challenges, puzzles, contests, and multiplayer coding sessions.

I’ve been using it and it’s pretty great. I always thought myself as a sh***y programmer, but this website has me thinking the opposite now!
So for anybody who wants to shape up their programming skills and or learn some new things about game development, give it a shot!

Anybody know any other websites/services/tools similar to this?

thank you for the information, i will give it a look!