How does a new KDP writer supposed to market a book?

A) Build a following on social media, a following of people who will buy your books. Good luck with that. There is very little evidence that social media can translate to sales.

If your book is well presented, well written, and basically free of typos, then

Because you cannot persuade readers to buy any book in which sentences do not make sense. This shouldn't be “does.” If you don't see the problem, that is a big problem.

Robotic table tennis system predicts ball trajectory and adapts swing in real time - Tech Xplore

Are you planning to proofread your book to avoid sentences such as

Or

D) that are presented with bad covers, bad descriptions, or ludicrously bad interior formatting.

Japan Is Ready to Fight a $385 Billion Annual Polluting Beast by Offering a Greener Alternative to Traditional Cement - The Daily Galaxy

D) Pay promotion services like Written Word Media to promote your book. Legitimate services will not accept your book for promotion if the presentation is crappy or the book is badly written.

You cannot effectively promote books

How does a new KDP writer supposed to market a book?

Speech by Governor Kugler on the economic outlook and monetary policy - Federal Reserve Board (.gov)

C) Persuade book reviewers on BookTok or Substack or someplace to recommend your book. If your book is unreadably terrible, this is probably impossible.

A) that are not actually books.

Or

Bank of Japan leaves interest rate unadjusted at 0.5% as expected - FXStreet

E) Take a solid year to learn how to use Amazon or Facebook ads and be prepared to lose quite a bit of money as you figure it out.

B) Build a newsletter mailing list of people who will buy your book because they trust you to write books they want to read. This is slow, but ideal.

B) that are filled to the brim with typos or errors.

Thin, Light and Built to Last: The New Era of the Galaxy Z Series - Samsung Newsroom

C) that are unreadably terrible in any other way.