Start with high-confidence skin care books, then narrow by subgenre or adjacent topics.
Skincare: the New Edit
Caroline Hirons
The Skinny Confidential's Get the F*ck Out of the Sun
Lauryn Evarts Bosstick, Dennis Gross
No-nonsense Skincare
Erum N. Ilyas, Erum Ilyas
Natural Skin Care at Home
Liz McQuerry
The Beauty Geek's Guide to Skin Care
Deborah Burnes
The Korean Skincare Bible
Lilan Yang, Leah Ganse