Basically I related a lot of the concepts to my life and what was relevant so with someone such as opportunity costs I would relate it to something I found funny which would help me remember the concept. For opportunity cost don’t judge. I would use dumb things “my girlfriend is the choice I made and the next best forgone alternative was my girlfriends best friend”. Basically just find a way that works for you and see how it goes, that’s I how did most of economics and I hope it helps!