There are expenses involved in running a website. These include hosting the website and expenses associated with mailing lists.
I have some affiliate links on the site to earn an income for the time involved,in order to cover these expenses.
Where I insert an affiliate link, and you click on it, it will take you to a different website.
In doing so if you buy something from that website, I will get a small payment.
This will not cost you any more money than you would have paid if you had gone straight to that website.
That is the same as if you searched for something through a search engine, then clicked on any one of it’s suggestions. You will pay the same for such an item as if you had clicked through an affiliate link.