[lolumadd_]

C is the grandfather of all languages, and it is so good in fact that it stood the test of time. (It was created in the 70's). It's still a really great and useful language to learn.

C# and Java are also really good and similar languages too. I like the language of C# better but don't like the fact that it's more bound to Windows unlike Java which is completely multiform.

C++ is just good all around and used in most professional environments.

My recommendation: learn all