Affiliate Marketing Secrets

I was already convinced to join his course- but still want to get somemore proof, hence asking here. . some if his students are commenting in youtube or the names amd pictures are posted on his website . . Pls share your experience. Is it really worth to try or really useful course to start an online store? I want to sell women’s clothings, but Im worry what kind of niche he will suggest me. He’s in US and I was in Hong Kong- his course is really applicable?
Thanks in advance.