6) Affiliate marketing
This Is one of the best online business ideas. Your job is to promote products of a particular brand. What you need to do first is sign up for free on an affiliate marketing platform and select the product you want to promote.
Then you promote that product on your own blog, in different forums, on social networks etc. You get a commission for every sale you get. Logically the product that promotions should be related to the topic your blog treats, in this way you attract the right customers.