
In the opening of Avengers 2012 it looks like we see Loki holding a staff, Kang the Conqueror doing his multiverse thing looking at a cube, then we meet Samuel L Jackson's character Nick Fury, and Hawkeye, who open a portal together at some lab.
I really don't remember much or understand the story, so that is why I am going to watch them again. Starting with Avengers 2012, then Avengers: Age of Ultron 2015, then Avengers: Infinity War 2018, and then Avengers: Endgame 2019. I know there are More Avengers movies than just the ones called Avengers, but I will be watching these four this week.
I think I saw most of these at some point over the years, but not in a sequence. It might take a week or so, but I will watch these movies again and hopefully have a better understanding of the entire story afterwards.

Oh here is Loki, looks like they brought him to the lab. "Please put down the spear." Nick shouts, but Loki immediately starts attacking everyone, clearly feeling threatened.
"I am Loki, of Asgard, and I am burdened with Glorious Purpose. I really enjoyed the Loki TV show, which gave him a chance at Redemption and allowed him to save the timelines.
Next we see Scarlett Johansen as Nikita, interrogating some thugs who think they are interrogating her. She is ordered to come back to Shield, and is next seen finding The Hulk. After that scene, we see Captain America training with a punching bag and Nick Fury arrives. After that, Iron Man doing something underwater, disconnecting transmission lines to set up power for his Stark Tower.
There is a new Avengers: Doomsday and Avengers: Secret Wars, to be released soon.
AGE OF ULTRON

When it started out, Jarvis was just a natural language UI,
now he runs my iron legion. He runs more of the business than anyone besides Pepper. Top of the line.
Jarvis: I suspect not for long.
/Tony Stark scans Loki's staff, that Scarlett Witch delivered into his hands.
Stark: Meet the competition.
Banner: It looks like its thinking. I mean its not a human mind, look at this. Its like Neurons firing. Artificial intelligence.

Well this movie establishes that Tony Stark IS a villian. Perhaps only a hero because of those who surrounded him and checked his hubris. Maybe this is reveals part of the Doomsday story.

"What comes out of Wakanda?" The strongest metal on earth.

Tony Stark has to fight the Hulk who has been manipulated by Scarlett Witch and they destroy multiple buildings in their Hulkbuster battle. They traumatize the people of Wakanda and the army shows up. Tony and Hulk are sitting in the rubble.

Hawkeye's superpower is that he is just a regular dude with a family.
