[llamataboot]

exercism.io has been an amazing tool to improve my Ruby skills (I can't speak to any other languages yet) although it seems that nitpicks have become a bit on the light side lately.

I'd challenge anyone to pick a language they are semi-comfortable in or a brand new-language and do a month of exercism exercises, refactoring as you get comments, and then moving onto the next exercise.

Even 15 minutes of code practice a day goes a long way.

[llamataboot]

and I should say, don't forget to critique your peers' code as well (gently and respectfully) as the site points out, reading and critiquing code is just as useful practice in getting better at coding as writing code.