The following step is perhaps the most challenging part of the process. A niche is a specialization or expertise. You cannot just go online and sell every item you think is popular.
Once you start bringing in money, you can reinvest some of it in paid traffic. You just create an ad (on a search engine or social media platform) and it draws people into your site. While it's not a guarantee that you'll get affiliate sales, it's still a great way to build traffic and potentially get your site ranked higher so it's found more often by the people who are interested in what you have to offer.

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For those of you just starting out with affiliate marketing, drill down as specific as possible after shortlisting 4-5 of the niches that interest you. When deciding on your niche, instead of personal finance in general, you want to drill this down even further into sub-niches like Personal Finance for University Students In Debt, or Personal Finance Tips & Tricks for Expats Living In *Insert Country Here*.