Prepping for Captain Marvel

I was not a huge fan of the very first one, but it seems important, if for no other reason than it explains who the Red Skull is, and how he came to be guarding an Infinity Stone. It also gives depth to Bucky, so it isn't some random thing when he and Steve meet again in The Winter Soldier.

The Iron movies are fun... well the first two are, anyway... but none seem particularly important to the overall story. It's obvious who and what Stark is, and how his armor works. If anything, even though a lot of people seem to dislike it, I'd include Iron Man 2 because it's the most fun of the three. Mickey Rourke is subtly hilarious as Whiplash, and he really carries the film. Sam Rockwell is great as well.

The difficult part will be finding the time to watch all of these between now and the 7th!

I realize I didn't include in my original post that prepping for Captain Marvel is step one. She wants to be clued in going into Captain Marvel so she can have more or the less the full story to bring into Endgame in April.

As an aside, one of the great things about all the MCU films to this point has been the way the creators have managed to make every film a fully satisfying standalone film while telling a complex narrative throughout. Infinity War was remarkable, and perhaps unprecedented, in this regard. I know of no other film that told a complete tale, and ended with no more story left to tell while simultaneously leaving its audience clamoring to know what comes next.