Real estate is one of the key ways to supplement your income. It is something many people learned way before I did. My wife and I bought our first home when I was 39. We knew nothing. However, we improved the property and after owning it for 10 years it had doubled in value.
When I took the course for becoming an agent, I added the MBA thinking and systematized the process. I also realized that the market was likely to crash and was warning people. We were renting from 2004-2008.
Three of my four children own homes and are doing quite well. One of the three is a general contractor and has built two spec homes, several custom homes and performed many remodel projects.
This book is a great primer on real estate investing. I give you a system to evaluate homes.