Is there any sense to finish all courses of sololearn or focusing on something alone?

Answer 1

That's completely up to you. The more you know, the better you are, so it can't hurt, right?

I know most of them, and they're useful when I'm in situations that call for them. As well, by knowing all of them, it gives me more options that I may not have considered otherwise.

Again, it'll only make you better overall, not worse.

Answer 2

I think that finishing of all courses will give me a general understanding of the concept of programming