If you are into some kind of programming or work in IT, be sure to learn atleast the basics of C.
It has been and will be the basis for many operating systems /applications /languages. Be warned, it will not be simple as the current 'clerical' scripting languages.
In these days of 'high productivity' programming languages, still many manufacturing / high availability (stable)applications run in C.
You can find a lot of websites offering tutorials.
Good luck.