Cognitive Behavioral Therapy and Narcissism?

Ive been recomended CBT my entire therqpy history and never was explained as far as what it is and how it helps. My "therapist" (who was actually just a social worker) kept showing me a fucking triangle with something like "trigger" "reaction" "thought". Shit never made sense and itd actually rly frusterate me cause he didnt explain it well.

Well CBT was mentioned in my book (that ive refered to a bunch ik) and how it specifically helps with behavioral disorders like NPD.

Does anyone have any experiences with CBT, advice on how to reapproach it, and what to expect doing it or anything relevant?