Learning how to design mobile apps is a tremendously popular activity now for many young programmers. If you have the passion and focus to build new mobile apps using modern software tools, then you can gain a great boost to your career learning about the theory, concepts, and practicalities of mobile apps.
If you are the kind of person to make a decision to learn something new and then start to create with that knowledge, then pursuing how to learn app design might be a perfect knowledge path for you.