Below are some factors which you can consider.
Research on other popular websites and see if they have been using the same keywords for same products you have or not.
Do not rely on keyword research tool, try couple of tools and check the common keywords suggested by them.
Business owner or actual client have ideas what keywords people used to search their products. So first ask them to give you list of most relevant keywords.
Select the keywords with medium competition. you can use search query Allintitle: Keyword name in Google which would show you how much other websites have added that keywords into their title tag to evaluate the competition of specific keywords.



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