(#3) The Avengers Can Take The Infinity Stones To The Future As Long As They Return Them To The Past
Many of the MCU's rules for time travel are a little contradictory, if not flat-out made up. Which is fine, by the way - the Russo brothers aren't advocating for the advancement of time travel technology; they're telling a story.
In simple terms, the Infinity Stones stabilize time itself. The Ancient One offers some elucidation, telling Bruce Banner that removing an Infinity Stone from the timeline interrupts the flow of time. However, the forces of good need the Infinity Stones to fight back against superhuman creatures like Dormammu.
If the Ancient One is to be believed - and she usually knows what she's talking about - removing the Infinity Stones from their point in the timeline not only makes that timeline more susceptible to the forces of evil, but creates a new reality. That's why Cap has to return the Stones to their original points on the timeline.
(#6) Time Travel Relies On The Quantum Realm
To time travel in the MCU, you have to use either the Time Stone or the Quantum Realm. Barring some divergent timeline in which everyone has a Time Stone, the Avengers have to shrink down and travel through the Quantum Realm to go from point to point.
Unfortunately you can't just hop into the Quantum Realm and end up at the Battle of New York; you have to use Tony Stark's "reverse mobius strip" map of the QR, which spits you out at a specific point in time and allows you to return exactly when you left.
(#1) In The MCU, Changing Things In The Past Doesn't Change The Future
Most of us, including Scott Lang and Rhodey, get our time travel knowledge from movies like Back to the Future and Timecop. In those movies, if you change something in the past, you also change the present. For instance, in Back to the Future, Marty McFly helps his dad be less of a dweeb in the 1950s. When Marty returns to the '80s, his family is living a nice upper-class life.
That's not how time travel works in the MCU. When Rhodey suggests offing Thanos as a child in order to undo the snap, Bruce Banner says, "I don’t know why everyone believes that, but that isn’t true. Think about it: If you travel to the past, that past becomes your future, and your former present becomes the past! Which can’t now be changed by your new future!"
(#4) Several Parallel Universes Potentially Exist Because Of 'Endgame'
By going back and changing minor pieces of the MCU timeline, the Avengers have likely created a series of parallel universes. While they haven't done anything in their timeline - aside from saving the universe and offing Thanos twice - they have altered other timelines, for better or worse.
In their trip to 2012, the crew created at least two alternate realities. Loki is now alive and in possession of the Tesseract, and HYDRA either believes Cap is one of them, or she thinks they're going to jumpstart the events of Winter Soldier. Either way, 2012 is rendered completely different. It's also possible that Loki now exists in the current MCU timeline in spite of his supposed demise at the hands of Thanos in Infinity War.
There's no way to know whether these new realities will affect the current MCU timeline, but now that time travel is officially on the table, anything is possible.
(#10) Captain America Messes Everything Up
Even though Endgame sets up a whole host of rules for time travel, Captain America breaks pretty much all of them at the end of the movie. After returning the Infinity Stones to their rightful places, he goes off to live his life - in the past. It's been theorized that his actions mean the Infinity Stones were still destroyed by Thanos, rendering time travel impossible.
Even if this isn't the case, Cap still may have altered the events of Winter Soldier. By marrying Peggy Carter, he creates a kind of time loop, and also removes her original husband from the equation. There are also questions about how Cap made it back to the Quantum platform as an old man. On top of that, shouldn't Cap be in an alternate universe, just as Thanos found himself in a new timeline when War Machine and Nebula traveled back to the events of Guardians of the Galaxy?
The existence of Old Man Rogers at the end throws the logic of the movie out the window - but maybe that's okay, because it gives the audience a moment of catharsis nearly a decade in the making.
(#9) In The Quantum Realm, Time Can Travel Through You
Characters can't just shrink into the Quantum Realm and start zipping through time. Without the proper means of maneuvering around the QR, you can end up trapped inside. As Scott Lang discovers, time travels through you rather than you traveling through time. That means you age at odd rates, growing older or younger each time you shrink down.
When Lang comes back as an old man, it doesn't mean he was stuck in the Quantum Realm for 50 years, it just means the Quantum Realm instantaneously aged him 50 years. Without a roadmap for how to traverse the realm and use it to your advantage, you won't be able to get anywhere.
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Have you ever watched the Avengers: Endgame? At the end of the last Avengers movie, Thanos uses powerful Infinity Stones to destroy half of all life in the universe. The superheroes in the sequel try their best to undo the damage by time travel. They need to travel back in time and collect all the Infinity Stones. This is one of the most impressive plots in Avengers: Endgame.
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