Yes, a niche is very important in Affiliate Marketing.
A niche is a specialized market that appeals to a specific group of people. If you are trying to earn money with affiliate marketing, it is best to choose a niche that you are familiar with or interested in. This will make it easier for you to create content and write blog posts about the topic.
If you are choosing a niche, it is also important to make sure there is enough interest in the subject. You don't want to spend time creating content about a topic that no one is reading or viewing.
Choosing a niche can be difficult, and it may take trial and error before you find one that works for you. Once you do, though, it will be worth the effort as you can start earning money with your blog or website.
A good way to find a profitable niche is to do some keyword research. Find out which keywords people use when searching for products or services or information about your niche.
You may make use of platforms like Exploding Topics, Google Trends, any keyword research tools, Google Autosuggestions, Answer The Public, and Also Asked which will guide you to make an effective decision for identification of a niche in affiliate marketing.
Here's related information that you may find helpful – 37 Hard Secrets Every Beginner or Intermediate Affiliate Marketer Need To Be Aware Of.
P.S:
You are currently on the Digital Marketing Forum page; for more information on various topics that may be helpful, please visit Blog Posts (button below) and [share any content post you love] with your network.
[Make it easier for yourself to find the right affiliate program and niche]
[Want to grow & stay ahead of your competitors? - use these e-Newsletters to your advantage!]
[If you have any specific questions in mind, please drop a mail and I will answer through a post at the earliest possible time]. Check this forum frequently for fresh posts.