Spoilers for Avengers: Endgame abound!
Video producer Marco is talented. Hell, let’s say megatalented. He was able to produce the above video, which not only explains how time travel really worked in Avengers: Endgame, but also how these events might impact the future of the Marvel Cinematic Universe.
I won’t spoil it. You should watch it! Suffice it to say that Mysterio’s claim of the multiverse in the new Spider-Man: Far From Home trailer might be true, although I might not trust his particular point of view.