Which one do you choose? Java / Python / C / C# / C++ / Ruby

Answer 1

If you have any confusion to choose the language you can read this article.
https://www.sololearn.com/faq/#q1

Answer 2

depends on your goals.

Answer 3

it depends on what you are trying to make, though i personally would use c++/java over everything else

Answer 4

Python / Ruby = POWWWWER

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