Authors spend thousands on advertising while leaving the two highest-leverage levers on Amazon completely untouched. Categories and keywords are free, take an afternoon, and routinely move more copies than a month of ads.
Why categories matter more than you think
Amazon sorts every book into browse categories, and those categories generate bestseller rankings. A book ranking #3 in a specific sub-category gets an orange bestseller flag, appears in "Best Sellers" browse lists, and feeds Amazon's own recommendation engine. A book in an over-broad category ranks #40,000 and is invisible.
The mistake almost everyone makes is choosing the biggest relevant category. "Business & Money" contains millions of titles; you will never rank. "Business & Money > Management & Leadership > Negotiating" contains a few thousand, and ranking in the top ten there is realistic on launch week.
How to research categories properly
Find five books genuinely comparable to yours — similar length, similar audience, published in the last three years. On each product page, scroll to "Best Sellers Rank" and note every category listed and its rank. Then look at what sales rank the #10 book in each of those categories has. If the #10 book has an overall Amazon rank of 80,000 or worse, that category is reachable for a well-executed launch.
The seven keyword slots
KDP gives you seven keyword fields, and most authors put single words in them. That wastes six of the seven. Each field accepts a phrase of up to 50 characters, and Amazon matches against the whole string.
Use them for search phrases a reader would actually type — not descriptors of your book. "books for new managers first time" is a search. "leadership" is not; it is a category you will never win.
Where to find real search phrases
Type the start of a phrase into the Amazon search bar and read the autocomplete suggestions. Those are real, ranked, frequently-searched strings, given to you free. Do it for ten seed phrases and you will have far more good keywords than seven slots can hold.
Never put your own title, your author name, or another author's name in a keyword field. The first two are already indexed, and the third violates Amazon's terms.
The description is a sales page, not a summary
Amazon indexes your description and readers decide from it. Most author descriptions summarise the plot or list the contents. Neither sells.
The structure that does work: a hook line that names the reader's problem or the story's central tension; three to four short paragraphs of specifics; a bulleted list of what the reader gets; and a closing line that assumes the sale. Use the limited HTML KDP permits — bold, headers and line breaks — because a wall of unbroken text converts badly on mobile, where most browsing happens.
A realistic afternoon's work
- Research ten comparable titles and log their categories and ranks (60 minutes)
- Pick two categories you can realistically rank top ten in (20 minutes)
- Build twenty keyword phrases from Amazon autocomplete, pick the best seven (45 minutes)
- Rewrite the description as a sales page with proper formatting (60 minutes)
- Request additional categories from KDP support — you can have up to ten (15 minutes)
That is about three and a half hours, costs nothing, and in our experience moves more units in the following quarter than the first £500 of advertising would have.