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

You cannot effectively promote books

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.

C) that are unreadably terrible in any other way.

Imagine we could fly into space and take a selfie of our galaxy. This spacecraft made the most detailed map of the Milky Way ever - BBC Sky at Night Magazine

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.

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

Has your wife or girlfriend ever been felt up in public by a stranger?

A) that are not actually books.

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

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

What are your political and economic beliefs? How did you form them, especially in comparison to those who hold opposing views?

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

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

Or

Can we trust the Bible when Constantine and the First Council of Nicaea took out many books of the Bible and altered existing translation by removing things?

Or

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.

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

Why is my Whirlpool fridge not cooling but the freezer works? What is the solution?

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.