1. Become awesome at Excel.
2. Learn how to code.
3. Make a dynamic website.
4. Learn to make a mobile game.
If you're not interested in coding anything other than fun game apps, you could try this course from the University of Reading. It promises to teach you how to build a game in Java, even if you don't have programming experience! If you want to make a truly great game, you might want to read/listen up on Game Theory first.