There are a couple of main ways to approach an MCU rewatch though if you want to have some sense of order. You can either ...

Want to catch up before the next release, or just revisit the universe for a refresher? Here's the order to rewatch the entire MCU timeline.

Find out how to watch all the Marvel movies in chronological order or release order, and where the MCU Disney+ shows fit into the timeline.

If you want to watch all the Marvel movies in chronological order, then you have to start with Captain America: The First Avenger. Not the best Marvel movie by a long shot, but given it takes place ...