There are a lot of ways to do keyword research. But, if you want to find low competition keywords that you can rank for quickly, then the KDP Keyword Research Step By Step Method is the way to go.
This method is based on the assumption that you are targeting a specific niche or topic.
1. Find a topic or niche that you are interested in or passionate about.
2. Brainstorm a list of keywords related to that topic.
3. Use the Google Adwords Keyword Planner to find keywords that have a low competition rating.
4. Use those keywords to create a title and description for your book.
5. Write your book and publish it on Amazon.
The KDP Keyword Research Step By Step Method is a time tested method that will help you find low competition keywords that you can rank for quickly.