i went through them and i studied many courses, lets say you are competing with me on amazon, you have no chance against me; i tell you, bcs I know much more then you even if you went through the amazon courses bcs i went deep in each topic, for example you will need Copywriting courses if you want to write a good product description that convince people to buy, and you will need SEO courses to rank your product in amazon and show up in the first pages of search and by this way you will get more sales organically, and also you will need facebook ads courses and google adword courses and Instagram marketing courses to get sales outside of amazon (paid promotion) and alot more and also you are getting alot more than what you will pay for bcs 69$ is nothing