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 ...

Then, the rest of the films then vaguely take place in line with the order they were released ... To fix Tony's mistake the Avengers must once again assemble to save the world.

Phase 1 involved the Avengers assembling ... now officially correct above if you want to watch the Marvel movies in chronological order. We should warn you, however: Marvel doesn't always take ...