Can you develop awesome application after completing a course completely. Or you need to work on that course over internet.

Answer 1

Sololearn , give you only the basics of the programming language , you need to learn a lot more to become good developer :)
if you want learn more about web development check out "wh3-schools" on internt :D

Answer 2

Sololearn is foundqtion builder. You have to do further reading yourself
https://www.sololearn.com/discuss/99903/?ref=app
https://www.sololearn.com/discuss/688949/?ref=app

Answer 3

The disliker, why do you disagree?

Answer 4

He is purely jealous for not getting 12XP