How become strong in challenging in this app ?

Question

challenge

Answer 1

challenge. When the challenge is complete try to figure out the quizzes that you got wrong. If you can't search the web, run it through a compiler, debug it, read some more, until you can.

Answer 2

Learn more ...

Answer 3

learn from Nikolay. :D

Answer 4

challenge more ..

Answer 5

I'm learning myself

Answer 6

شكرا