Cash flow

I've been playing Cash Flow 101 and this is what I've learned.
1. If It is not an appreciation asset, purchase with cash
2. Focus on increasing passive income 1st, then focus on building assets (because once you replace your income, you have more freedom and can build wealth)
3. When investing, think about return on investment. How soon will you see a profit?
4. Try to make money when selling assets. Avoid selling at a loss if you can help it especially if it's generating income for you.