what do I need to start if I want to develope an app that provides more options or tools for social sites?!

Question

like Facebook ...

Answer 1

You are not able to develop more options or tools for other websites. You can just develop options and tools for your own website or when you work for the social site.

Answer 2

You need to learn programming not just the synatx of a language but programming. After you master one programming language mastering the next one can be done in a month or less. So for app development, start with java and then swift.