https://github.com/onlurking/awesome-infosec
Books:
This Is How They Tell Me the World Ends: The Cyberweapons Arms Race https://www.amazon.com/dp/1635576059/
Social Engineering: The Science of Human Hacking https://www.amazon.com/dp/111943338X/
PTFM: Purple Team Field Manual https://www.amazon.com/dp/B08LJV1QCD/
I issue these to all new cyber hires in a senior infosec role.
For someone coming fresh into building infosec programs from scratch, I recommend Creating an Information Security Program from Scratch https://www.amazon.com/dp/0367554658/
If you want to go splunking for publicly exposed vulnerabilities, Shodan occasionally runs personal account specials: http://shodan.io/
If you put an email address in your profile, I’d be happy to gift a book bundle to you.