It’s actually quite simple.
1. Earn more than you spend. This one is obvious. If you don’t earn very much – cut down on your spending.
2. Passive income. You need to make money when you sleep. The easiest form of passive income is money on a bank account that carries interest, but that’s a very passive income. The most effective (but also most difficult) form of passive income is to launch a business that can run by itself without your constant attention.
3. Time. It will take time. Accept this fact and the temptation of easy money will not be as strong.