How to learn to master new language quickly and correctly for a mature programmer

1. How to be proficient in a language?

For my use. Not to write, is never going deep.

Encounter problems, can use the characteristics of the language to solve.

2. There are similar things in each language:

Built-in data structure

Syntax Convention

Code structure/management

System API (provides libraries associated with the operating system)

Dependency Management

Garbage collection

　　

3. Each language has its own strengths

Go:concurency

Python:data operation

How to learn to master new language quickly and correctly for a mature programmer