Want to dive in to learning OSINT?

Here are my favorite OSINT books:

OSINT Techniques: Resources for Uncovering Online Information by Michael Bazzell

Deep Dive: Exploring the Real-world Value of Open Source Intelligence by Rae Baker, Maritime SME, Private Inv, CISSP Baker

OSINT: The Authoritative Guide to Due Diligence by Cynthia Hetherington