Start with high-confidence product design books, then narrow by subgenre or adjacent topics.
The Origin of Brands
Al Ries, Laura Ries
Designing Interactions
Bill Moggridge
The Laws of Simplicity
John Maeda
The Design of Everyday Things
Don Norman
The Evolution of Useful Things
Henry Petroski
This Is Service Design Thinking
Marc Stickdorn, Jakob Schneider
Value Proposition Design
Alexander Osterwalder, Yves Pigneur
The Design Thinking Playbook
Michael Lewrick, Patrick Link
Design Thinking and Innovation Metrics
Michael Lewrick
The Jobs to Be Done Playbook
Jim Kalbach, Michael Schrage
Models, Methods and Tools for Product Service Design
Laura Cattaneo, Sergio Terzi
