How can I advance to level, say, 13

Question

I've just completed the SQL fundamentals level 3

Answer 1

Complete more courses, publicize more Code Playground projects for upvotes, participate in the Q&A, Challenge others, etc. There are lots of ways to gain XP and level up. Others have posted some interesting strategies in prior threads, so use the search bar if you're curious.

Answer 2

thanks

Answer 3

Challenges get you a lot of points.