Search engines want to give useful content. The better you know a topic, or are willing to research and learn about it, the better your content is going to be. You also need to make sure the niche is something you enjoy writing about. If you’re an expert at cubicle based work furniture but you hate every minute spent thinking about it, then you’re not going to last long enough to see any affiliate returns.
For example, this blog, Marketingamateur.com is for marketing amateurs who want to learn and grow into professionals in the marketing industry.

Affiliating to a business that has products in the market is way better than those who do not. Specifically, when talking about products, make sure that they own multiple products like HOSTNOC so that you can promote as many as you can.
The KW research tool will proceed to create a sort of mind map-style keyword tree starting from your main topic and branching out into similar phrases and questions that people have been searching for on the internet. If you need all this information with you at all times, you can download it as a CSV or PNG document for reference.