How can I became expert on cc+

Answer 1

practice a lot...
Isn't it obvious?
No pain, no gain.

Answer 2

practice, practice, practice....and more practice. then sleep, wake up then practice again. did i mention that you should practice?

Answer 3

Personally I went to an educational institution which provides a variety on things that can get you pretty close to being an expert.
There's books, practice, experience in the field and projects. If you're passionate about it maybe take some courses online for free? Good luck!