Should i focus on one language at a time?

Question

I have intermediate knowledge in HTML,CSS and php. Now I started learning java also. My goal is to develop websites, web apps, and android apps. Is it possible to learn all at a time and become expert? Or should I focus on HTML CSS and PHP?

Answer 1

Focus on HTML, CSS, JS.
abandon Java for now……

Answer 2

and... practice! Don't just fill those questions with the same number of characters than the answer. The best way to learn is to develop your projects...

Answer 3

Thanks