How can someone know a good product to market as an affiliate marketer.

I am very choicy about what I promote. First you want a product that is wanted and needed. When I see a product I am interested in, I do my due diligence by looking for reviews of those who have used it.

I check out the creator of the product and see if they have previous products. I want to know what people say about the creators. Make sure it is something that will help people.