There are several ways of doing affiliate marketing. In general, there are 2 types of products (physical products and software's).

Some popular ways of doing affiliate marketing.

1. You can create blogs around a particular niche and then include the related products with affiliate links (Amazon affiliate, ClickBank, etc).
2. You can have your own YouTube channel where you can mention about the product and include the link in the description.
3. Create an eBook (in your area of expertise) and mention affiliate links in it. And then promote it via website or email marketing or Amazon.

The more people click on your affiliate links and purchase the product, the more commission you will get.

Note: Software and online tools have more earning commission compared to the physical product. Also, Software's affiliate marketing prodvides recurring comission.