This Amazon help page discusses how to optimize listings for search and browse, and the second half of the page specifically provides best practices for keywords. It discusses formatting, provides good and bad examples of keywords, etc.
Best of luck with your sales.
Think about how someone would SEARCH for your product.
Write those terms in.
Do not duplicate words in the title, description, or bullet points as those words are already indexed, and keyword spamming may cause your item to rank lower in searches.
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