Prosperi is a good learning tool for basics. If you have some knowledge, you will still have to go through beginning lessons and watch all the videos, which are really good. This means you have to pay for lessons that do not help you grow in the knowledge you were seeking. There is no way to advance other than to go through each lesson as it is served. Like many subscription services, Prosperi is set up to make sure they get one more payment before you can cancel unless you are extremely vigilant. There is no renewal notification, and billing dates are subject to change without notice. They require 30 days notice prior to the billing date. Customer service is by Bot obviously since they answered my request to cancel and stop the billing charge in less than 5 minutes. So...buyer beware and check your trials often!