Should i learn c++ or javascript?

Answer 1

C++ if you are interested in developing desktop programs, games etc.
Javascript if you are interested in making your websites interactive.
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Answer 2

That depends on what you want to do/program.
Both languages have their own fields where they are used at and good at, so you have to choose what you want to program first and based on that decision pick a language that is good for your kind of program.