Hey Eldon55, learning a new programming language is very much like learning a conversational language, your proficiency improves with practice. As you learn more and more languages, it is important to use each one from time to time so you don't loose touch.

My recommendation is to focus on one to two languages in the beginning until you are very fluent in them before learning new languages. And if you ever forget anything, the official documentation is always a good place to refresh your memory.