House Flipping
By now, the business model of House Flipping is well known and somewhat saturated. But there is always money to be made when work is put in. The model is simple enough - buy a property, renovate, and resell. We love watching TV shows about this process, and this is one of the most popular models. If you are willing to put in the work, this is a tried and true way to make money and be your own boss.
Upside: Relatively quick way to make money and turn profit. Tried and true business model
Downside: A lot of work involved, and substantial risk