You are free to not to stick with only one affiliate program, as you can choose your niche based on your skills and promote them repeatedly for better results. This approach increases the chances of your earnings as it maximizes the opportunity of earning massively and mitigates the risks of failure. Hence, it is always advisable to keep your portfolio diversified.
Let’s say, this is How to be Interesting: Places to Go, Things to Do. There we go. What we would do is we would go to Amazon and say, “All right.” First of all, Amazon’s affiliate program is called Amazon Associates. Amazon Associates is where you would go sign up and you can join for free, and I think you have to sell three products within the first three months or the first 90 days or whatever to actually be a fully-fledged affiliate.

The links lead to specially designed landing pages of the product or service provider that the affiliate “works for”. These landing pages usually have some sort of a merchandise or service that they promote and sell.
You need to send a request to the merchant. Once the chosen merchant approves your application, you need to look for the links and generate traffic. Navigate to the Links tab on the header menu.