Knowing the approximate value of a property is only the first step to getting a good deal. Never be afraid to ask for a lower price and be an aggressive negotiator. The worst thing you can do is rush into a purchase or get bullied into one and pay too much. Successful real estate investing is a very long-term investment. You are going to be holding rental income property for decades so you better be happy with the price you paid.
If you have specialized knowledge in a certain topic, you can put together an online course to teach others. For example, if you have experience in real estate investing, you can create an online course “Real Estate Investing 101”. The benefit of an online course is that once you create the course material, you can sell it to as many people as you want.