I've found the Privacy Crash Course series on Michael Bazzell's Privacy, Security, and OSINT Show to be a good introduction. It's just about electronic privacy rather than Opsec as a whole, but that's an important part of it.
First episode here: https://soundcloud.com/user-98066669/174-privacy-crash-course-01-passwords-2fa
I've found the Privacy Crash Course series on Michael Bazzell's Privacy, Security, and OSINT Show to be a good introduction. It's just about electronic privacy rather than Opsec as a whole, but that's an important part of it. First episode here: https://soundcloud.com/user-98066669/174-privacy-crash-course-01-passwords-2fa