Is SoloLearn just for the basic learning?

Question

what's next step after completing a course? how to master that language?

Answer 1

Books, read more on the web, take courses in universities and more

Answer 2

Dont master a language just the foundations. languages are always updating with new batches etc.

Answer 3

Do challenges like this one
https://www.sololearn.com/discuss/1257811/?ref=app