Learn one language well. Then learn a second one.

In order to move beyond the basics, you need to learn your first language well. Then your second language will be much, much easier.

From there, you can branch out, and become a more well-rounded developer by learning lots of languages:

• C is a great way to learn how computers actually work in terms of memory management, and is useful in high-performance computing
• C++ is great for game development.
• Python is awesome for science and statistics.
• Java is important if you want to work at large tech companies.