Solve a problem and you become wealthy. Also, always choose smart work over hard work. You can choose to be rich through smart work or hard work, it's all left for you to choose exactly what you want.
I would like you to choose smart work over hard work because smart work will help you to be more productive. So, whenever you have any work to do, try to figure out the fastest, easiest and most efficient way to do that work; that's what makes you smart.
Furthermore, if you desire to gather wealth very fast just look for a problem and solve it, and you will become wealthy. The more people your solution can reach, and the more effectively it can really help them, the more money you will be able to make.