After Sololearn, what else - How will you levelup your skills?

Question

What else are you doing along with Sololearn?

1) Courses on Udemy | Udacity | Pluralsight | Lynda?
2) Books (top rated on Amazon.com) eg: for Javascript, books like JavaScript the good parts, JavaScript the definitive guide, you don't know JS series and so on.
3) Competitive programming, after studing Data Structures and Algorithms - on sites like HackerRank | Codechef | Codewars | TopCoders etc.
4) Contributing on a small to mid size projects on Github
5) Anything else?

Answer 1

Daniel Shiffman channel on youtube.
The coding train.
OOP made less boring

Answer 2

And tell me one thing which is helping you in leveling-up your skills exponentially.