What can I decided when use which program language?

Question

I am always confused about choose a proper language for pargramming. For example, I can calclute a Math problem with Java or JavaScript in a web project.But I am not sure which one is more proper, how can I decide?

Answer 1

if you want to make apps the bests are java and C but Html is easier

Answer 2

That depends on your target platform/audience.