Do you use solo learn as a way to learn new skills or to revise on languages that you already know?

Question

I found out that even on things that I was comfortable with, like SQL, I got something out from doing the whole course here. Next, I'll have a go at something I have not done before. how about you?

Answer 1

I use it to learn new skills and then use the challenge section to test my skills.
I don't think it's the best to revise on already learnt skills as most of the things are basic.
I wish there was challenges for all the courses.