The capitalization rate approach to real estate valuation is much more straight-forward but may not give you a true market value. The cap rate is simply the annual net operating income (NOI) of the property divided by the cost or value. Net operating income is the amount left from rents after all expenses are paid but before taxes and interest payments.
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.