In no particular order, here are ten resources on marketing for writers, including some mega lists of resources, like the post from Book Bub.
For books on marketing, check out Guerrilla Marketing for Writers, plus books by Dan Blank, Wendy H. Jones and Joanna Penn – see below.
How to Market Your Book When You Hate Marketing
5 Marketing Strategies for Writers Who Hate Promoting Their Own Work
Posts on writer marketing from the team behind the Writers’ and Artists Yearbook
Michael Hyatt on creating an author platform
How to grow your audience from Dan Blank
The Ultimate Guide to Book Marketing by Diana Urban from Book Bub
7 Guerrilla Book Marketing Tips from IngramSpark
Books on author marketing by Rick Frishman, including Guerrilla Marketing for Writers: 100 No-Cost, Low-Cost Weapons for Selling Your Work
My review of Power Packed Book Marketing: Sell More Books by Wendy H. Jones