a fun challenge is just trying to recreate a website that already exists. Even if you end of copying and pasting code bits as that's fine as long as you understand what the bits do.
I've done very little with it, I got so stuck on the FCC lessons and I've tried a few classes but none of them seem to translate into A. enough of an understanding to write my own even very basic code and B. enough to go back to FCC and be able to get further in the lessons.
I feel comfortable with the html / css but could definitely stand to improve. I may run through SQL myself there's a job i have a pretty good chance of getting right now that is looking for knowledge of sql because they don't have an actual DBA at the moment