Just keep learning languages. I've learned around 30 so far. It's best to understand the concepts more than the language. Know the concepts and the transition to another language is as easy as syntax and functions unique to that language.
There's a enough documentation on the internet that you can just use google without me having to tell you.
It's better to practice and use the language when learning it rather than just reading documentation. Come up with a project
(this is when I was learning Python) and run with it.