Programming languages are tools. Asking what’s the best to learn is like asking a carpenter whether you should level up your hammering or sawing skills.
Python is huuuuuuge these days. Especially data processing and machine learning with the pandas and Tensor Flow libraries.
Javascript is used in nearly every single webpage in existence and very popular.
But my personal opinion is to go with C then C++. They are far more complicated and not used as much as they used to, but learning them teaches fundamentals of programming that you wouldn’t get from most other languages. Once you have C++ down, learning a new language should be a cinch.