C# is also a good choice as @mank stated, since a lot of businesses use that and its also your normal imperative language. It also depends on what you want to do. Do you want to work at an insurance/other corporate business? Then you might want to learn MongoDB, SQL, Php, C#, Python. Do you want to work on an operating system or robot? Then you might want to learn C, C++, VHDL, assembly.