This would not be a popular opinion, but it is mine and I will share it with you.
I would personally start with a language like Scala.
If you are going to learn one language, this language is well worth the effort of learning.
There will be other languages like Go, Swift, Perl, Elixir, Nims, Rust, Ruby that people will suggest, and they are all good choices, but ultimately not as a complete of a choice as Scala - stick with JVM, and stick with strong typing, it will save you a lot of headaches down the road.
If you cant stomach Scala, then settle for Python. It will get you far and wide, and you will be able to get shit done quick and almost as good as with Scala, but you'll need some additional tools once you reach that summit, and realize that Scala is a whole different mountain that you should've been climbing all along.
Good luck, have fun, and dont listen to the haters.