Use affiliate links to earn money

If you have a blog or website you can be part of an affiliate program. When you review a product, do a tutorial or recommend a brand, you can add the code to the URL and get a percentage if someone buys the item through it. you can earn money with that affiliate option, many pages bring what is a referral link in which you copy and paste it below your description of what you are giving, whether it is a product or if it is on an advertising page in the which you refer people to enter the site the more referrals you have the more desire.