Do object, field and record level security cause your head to spin?
Items like: OWD, Public Read/Write, Sharing Rules, View/Modify All, Permission Sets, etc.
I think it can get pretty darn confusing, but often a critical item that’s asked about in an interview.
If you could use some more examples along with a few demos, you might want to check out Mehdi Maujood‘s training on Pluralsight called: Salesforce Platform Fundamentals for Developers
Don’t let the name “Developer” scare you, the course is primarily on declarative concepts.
Acing interviewing questions around security can help give you an advantage, as I can tell you 1st hand, I’ve had candidates not know how security works and they did not move forward in the process.