If you ever wanted to make a video game, it is pretty easy nowadays having game engines and game development environments such as Unity 3D and Unreal Engine being free. There are also a lot of tutorials and documentation on how to use them.
When it comes to game design, there aren’t as many resources. In my opinion, one of the best book to learn about game design is “Level Up! The Guide to Great Video Game Design, 2nd Edition” by Scott Rogers.