I am beginner of coding and what should i do? I know only c language .which language sholud i start

Answer 1

Since you already know C, I would suggest looking into C++.

Answer 2

There are a lot of posts related to yours..... Search next time.
It all depends on what you want to code.
Games: C/C++/Java
Web: HTML/CSS/JS & PHP/Python (with Django)
Calculations: All of them