Captain Marvel is set before Infinity War and Ant-man and the Wasp is set at the same time, so it's really not that important to watch them. Although, I'd say you have to watch mid-credit scenes of these movies because they play as teasers for Endgame.
You may skip Captain Marvel though if you have background information about that character. However, you ...
Signs point to Ant-Man & The Wasp taking place sometime leading up to and/or during Infinity War
First, the most recent trailer starts off with Scott and Hope discussing the events of Civil War.
Additionally, Marvel's official synopsis specifically describes it as taking place in the aftermath of Civil War.
From the ...
He lives in Apartment 2A, on the third floor of the building (which also includes the upstairs attic, making it two floors). You can see this when he's standing at his front door, which opens directly into a stairway, and the apartment number is on the door when the FBI burst in.
He also shares the place with Luis, who's wearing PJs, and is surprised to see ...
The power for the lab does indeed come from Dr.Pym's fantastic particles but less so on them making a generator. It's actually powered on batteries, or a single battery to be precise.
Briefly seen in the trailer, and in the backgrounds during the movie, there is a massive Duracell battery that Hank is using as the power source for his entire lab. In fact, ...
I would like to explain these two mid-credits scenes in addition to AJ's answer.
Ant-Man and the Wasp
That's all you need to know before watching Avengers: Endgame (not counting Infinity War of course).
He says it because it's pretty much true at that point in the timeline, in that they are shadows of their former selves, nowhere near the size and scope they both once held.
S.H.I.E.L.D. is pretty much in disarray after the events of The Winter Soldier, in which we learn Hydra agents were able to infiltrate the agency in an effort to use their resources to ...
Time passes differently in the different layers.
Here's an excerpt from a interview with Kevin Feige.
Peter: So there are layers that time does not pass by?Kevin: That’s what they’ve told us. They’ve told us that it, time and physics and space work very differently down there. That was a big question during the development process. And as usual, you’...
In Infinity War When asked where Hawkeye and Ant Man are, Cap and the team (i think it was Romanoff actually) state that they took a plea deal to see their family, now while this could be seen as the team disagreeing with that decision by the way its reacted to, it more likely that they don't want to cause issues for Barton and Scott's plea deals, that ...
There is none.
They're just discussing intervals, some more narrow than others. Hank suggests [0.2, 0.9], and Scott suggests something smaller, [0.4, 0.6]. Since Hank thinks that's too narrow, they compromise on [0.3, 0.7]. The intervals are approximately centered around 0.5 and equidistant from there.
All you really need to know about Captain Marvel is that she showed up in the 90s, met Fury, and had an adventure. She gave him the pager before leaving for deep space; told him not to use it unless it was an emergency. Oh, and she can shoot mucho powerful energy beams, and fly, and is super strong.
Ant Man? Nothing important other than when we last saw ...
We can't know for certain.
There is nothing to suggest that the Quantum Realm shown in Ant-Man and Wasp behaves like it's comic book counterpart, the microverse.
Current comic continuity has not (to the best of my knowledge) touched on how the Soul Gems (Comic equivalent to Infinity Stones in the MCU) interact with the Microverse.
The MCU has ...
Spoilers ahead, having seen the movie today.
it would seem that the events of the movie take place leading up to and during Infinity War. This is further proven at the beginning of the film, where it’s established that this takes place close to two years after Civil War.
They didn't assume she might be alive - it was clear in the first movie that Hank (and by extension Hope) believed she was dead (or at least lost forever).
That changed when in Ant-Man, Scott entered the Quantum Realm and then made it back. This pushed Hank and Hope to experiment in trying to create the Quantum Tunnel in order to find out more about it.
Space and time are bonkers in the quantum realm.
It's possible that while floating around she got (maybe even exponentially) closer to home.
SF: So there are layers that time does not pass by?
KF: That’s what they’ve told us. They’ve told us that it, time and physics and space work very differently down there. But that was part of a, that was a ...
Probably Ant-Man was a lucky one.
In this break-down of the post-credits scene it's said that there is correlation between Infinity-War affects and Ant-Man.
It would appear that the rooftop scene takes place concurrently with the end of Avengers: Infinity War when Thanos snaps his fingers, randomly halving the universe.- Ant-Man and the Wasp Post Credits ...
In the first movie, Darren Cross shrinks a sheep which is in a special protective container, which acted as big suit. We can assume that Hank specially prepared the building and cars to work in a similar fashion.
According to director Payton Reed, there’s food in the Quantum Realm... possibly from a civilization:
[Janet Van Dyne] has this spear things and these other items that feel like it’s from some sort of culture. There’s something going down. It’s not just some wasteland.
[...] There is definitely a shot as Hank and Janet are blasting out of the Quantum ...
I would like to add some points to the excellent answer by Dave.
Hank believed that the quantum realm was irrelevant of time and space. So he thought that Janet might be alive.
a reality where all concepts of time and space become irrelevant
Of course this was not completely true as Janet aged but it is what he believed. He worked hard to rescue her and ...
I think this revolves around him using more energy to move his giant body, the energy he had remains the same but his body is bigger, that's why he gets tired more quickly.
One other explanation I heard is that his body was so big and the air molecules are so small that they didn't have a useful effect on him.
While the question of why growing to that size is tiring is not addressed, the fact that it is extremely draining does get mentioned earlier in the movie. When Hank, Hope and Scott meet with Bill Foster to request his help in tracking down the lab, Bill mentions that growing to the size seen on the news in Germany must have been exhausting, and Scott ...
Well, the movie coughs and mumbles "Pym particles" whenever someone asks about anything physics related. Is mass conserved or not when things shrink or get enlarged? Depends on what the plot needs at that moment. What about momentum? Depends on what the plot needs at that moment. Energy? You know it.
So the power source for the lab would be (depending on ...
Hank Pym is a celebrated scientist with considerable knowledge in particle-physics. Perhaps even using the pym-particle technology he can produce small and effective power generators.
Even assuming there is no direct application of the pym-particle to power generation, there's no reason why the lab, which is disguised as a fairly large office building, ...
After the Civil War, Scott has been house arrested for Two Years. (If he tries to escape his imprisonment would be for 20 years). The Movie Ant-Man and the Wasp are just before the Event of Infinity War, (Which is understood by the post-credits scene of AntMan and the Wasp)