There are many business models and each one requires due diligence. Due diligence includes the evaluation of the capital and work involved in comparison to relative risk and return.
Several examples in the first video have predictable results. The other examples in video one and then video two are illustrative where the actual results will be better or worse than presented.
These videos are not investment advice. They are intended to be educational as it has been my experience the concepts presented are often ignored. Several examples illustrate my preferences. However my preferences do not constitute recommendations. Each person is responsible for their own due diligence and decisions.
I am looking forward to your comments and questions