How to became professional coder??

Answer 1

Jus pick out one best language like java, c++, python, php.
And learn it completely and then move to the next language, you will find all languages easy if learn one properly.
One more thing You can't master the language if you don't practice,
So practice more, and do something (learn/practice ) every day, at least something...
If you are a programmer then you must be good at math.

Decent math is enough for Web Development.

Answer 2

with curiosity and practice