Affiliate Marketing Secrets

I was under the assumption that blogging on random topics just to hear others’ opinions who read it will help me make money but I think I had this whole thing wrong. Correct me if I am wrong but there are 2 types of bloggers 1. the ones who just blog to get their opinions out and voices heard and have no intentions of making money and those who want to make money and will only blog related to products they are advertising as affiliates to earn some residual income. So the latter would be the right way to go to make money not the first where you are just posting to make a stand on a subject matter since there is no product you can promote related to your random topic discussion….am i right