Do i even have to write here?
C#, Lua, Python/3, Ruby, etc. Which ones DA BEST?
Choosing which one is the best depends on what exactly you want to do.
I work with rbx lua, and also used python before but then found out C and C++ suit me better. It's really your choice, but make sure before starting with any of those to check their advantages and disadvantages and choose the one you think suits you the best.