Start with high-confidence cartooning books, then narrow by subgenre or adjacent topics.
The Monster Book of Manga
Estudio Joso, Fernando Casaus
Understanding Comics
Scott McCloud
Almost American Girl
Robin Ha
The Seuss, the Whole Seuss and Nothing But the Seuss
Charles Cohen
Pop Manga Drawing
Camilla d'Errico
How to Be a Manga Artist
Balthazar Pagani, Asuka Ozumi
Maybe an Artist, a Graphic Memoir
Liz Montague
Whatcha Mean, What's a Zine?
Esther Watson
The Cartoonist's Big Book of Drawing Animals
Christopher Hart
Human Anatomy Made Amazingly Easy
Draw More Furries
Jared Hodges, Lindsay Cibos-Hodges
Making Comics
Lynda Barry
Manga Art Secrets
Dalia Sharawna
Artists on Comics Art
Mark Salisbury
Master Guide to Drawing Anime
Dr. Mashirito's Ultimate Manga Techniques
Kazuhiko Torishima, Takanaka Shimotsuki