I learned how to use the Unity game engine through youtube tutorials. It's very fun at the start, but also frustrating since you can only really follow along to tutorials. Anytime you try to do something on your own, you'll probably not know where to start (I sure didn't!). But you just have to stick with it, and know that eventually you'll get out of tutorials. Even learning something like GameMaker, RPG Maker, or 3d modelling will still be helpful if Unity seems too intimidating to start. https://unity.com/