This is NOT a duplicate of:
- What is the MCU film "Critical Path" to get proper backstory before watching Avengers: Endgame? ("Contextual backstory" is different from "they visit it, or visually call it out")
- Is there any particular order in which one should watch the movies of Marvel Cinematic Universe? Why? (I'm definitely not talking about watching all of MCU, and certainly not what order to watch it in)
I've watched Endgame, and all of the prior MCU, and thoroughly enjoyed all the visual callbacks. If I wanted to show a non-devotee the film and have them 'get' all the references, then what would they need to have seen?
Creating this as a wiki answer.