CodeWars Challenges: Visit Here
A repository filled with codewars challenges (kata). Currently Ranked in the top 3% on the global leaderboard and ranked 4 kyu, I push at least 5 solutions every week.
Tech used: 
Everyday, the first thing I do is solve a Codewars Kata!
I consistently refactor and optimize my code, sometimes for efficiency, sometimes for readability.
The Biggest Lesson I learned in tackling this endless supply of questions is understanding that there is a long way to go. Not being able to answer a question is okay, as long as you take the initiative to improve. There's always opportunity to grow!