What is a good language to start learning right now ?

I'm just started learning my first programming language 2 months ago which is C++, knowing that is it not language that is on demand I started to wander, what is a good language to start learning right now ?

and by that I mean a language that is on demand right now and will most likely still be 10 years from now. and to be more specific I'm looking for one that is good for web developing and mobile apps