film starts with Clint training her daughter archery when the whole family disappears due to snap

Tony and Nebula stranded in space until Captain Marvel brings the ship down to Avengers HQ

Tony still pissed off with Cap. Takes out his chest reactor. Captain Marvel plans to kill Thanos. Rocket and Nebula knows where Thanos is

Avengers except Tony goes to space where Thanos is. Thanos is a farmer. He has burnt marks on his face and his gauntlet is out of order and fused to his arm. The Avengers grabbed hold of him and demands to know where the stones. Thor used Storm breaker to chop off his gauntlet arm.

Thanos says he used the stones to destroy the stones and he suffered the consequences.
Thor chopped off his head.

Then 5 years later

Tony and Pepper lives in a hut near a forest lake and have a 4/5 year old daughter.

Scott Lang escapes from the Quantum Realm thanks to his van parked in a storage garage. He finds the world in ruins. He went to a memorial site where tall gravestones list all ppl who vanished. He quickly went back home and reunites with Cassie Lang who is now bigger.

Scott visits Avengers HQ and tells him he's been stuck for 5 hrs and tells him there's a way to unfix everything that Thanos has done. They went to Tony but he refuses.

Then they meet Professor Hulk (who is Bruce with Hulk's physique and talks with Mark Ruffalo's voice). He doesn't know much about Quantum physics.

They tried doing some tests with Quantum Realm with Scott Lang with Hulk in controls. They screwed up a bit (Scott comes back as a kid, then a old man, then a baby, and back to normal).

Black Widow finds Clint/Ronin in Tokyo.

Tony comes back with a time bracelet GPS for team and gave back Cap's shield.

Hulk and Raccoon goes to Tonnsberg (Norway I think). It has been designated as New Asgard. They bump into Valkyrie. Then they meet Thor, Korg and Miek playing Fortnite. Thor is now a flabby out of shape drunk. Thor threatens a rival Fortnite with his version of 'swatting' when person calls Korg a dickhead.

The Avengers plan to go back to specific points to retrieve the Infinity Stones.

3 teams. 1 team to Battle of New York 2012.
2nd team to Morag
3rd team to Asgard 2013

Battle of New York. Hulk meets the Ancient One at Dr Stranger's future home. Ancient One refuses to give the Time Stone to Bruce but relents when Bruce tells her that Dr Strange will give the stone to Thanos.

Cap, Iron Man and Scott tries to retrieve the Tessaract after Loki surrenders. SHIELD/Hydra agents Crossbones and that bald guy with glasses in Winter Soldier retrieve the brief case containing the staff.
Past Hulk funnily has to walk down lots of flights of stairs as he can't go on lift due to maximum capacity.
Cap meets with Crossbones with the briefcase in elevator along with other Hydra agents. He convinces them to give him the briefcase containing the staff when he utters two words: Hail Hydra. Cap gets the briefcase.
Tony in disguise as a SWAT soldier tells Scott to disable his past self's chest reactor to give him a minor seizure while his past self meets up with Alexander Pierce who demands the Mind Stone and Loki.
Present Tony retrieves the briefcase but past Hulk accidentally knocks out Tony and Loki uses the confusion to teleport out with the Tessaract.
Present Cap accidentally meets with his 2012 self, and 2012 self thinks he's Loki in disguise. They fought and 2012 has present self in chokehold when he tells his past self that Bucky is alive. He then taps his past self with staff to knock him out.

In Asgard, fat Thor and Rocket plans to retrieve the Aether out of Jane Foster's body. Thor's mother meets his 'son' and know he's from the future. Rocket retrieves the aether out of Jane by prodding her off screen and gets chased by guards. Before Thor leaves, he retrieves Mjolnir!

On Morag, War Machine and Nebula stays on Morag while Clint and Nat goes to Voromir via a ship that Rocket miniatures for Clint.
Unknown to Nebula, her past self's nervous system and databanks are connected to each other and Thanos finds out where the stones are and how he meets his fate.

Cap and Tony transport back to 1970 at the SHIELD training site seen in Winter Soldier and goes underground to retrieve that era's Tessaract. Tony retrieves the Tesseract while meeting his dad. He calls himself Howard Potts.
Cap makes a prank call to young Hank Pym and sneaks into his office to steal 4 vials of Pym Particles. (Forgot to mention that the 3 teams has enough Pym particles to make one trip there and back). Cap also sees Margaret Carter. Cap and Tony teleport back to present.

WM and Nebula knocks out Quill during his dance in intro of GOTG. They got the stone and WM and Nebula was meant to teleport together but WM only succeeded. Present Nebula and past Nebula meets and fights and past Nebula takes her place to go back to present.

On Voromir, Clint and Nat meets the Red Skull as seen in Infinity War and is told how to retrieve the stone. Clint and Nat fought each other. Clint jumped off cliff but Nat catches him and held on by grappling rope. She falls off and dies like Gamora. Clint now has the Stone.

All members went back to present and everyone is devastated by Nat's death.
Tony and Bruce constructs the Infinity Gauntlet and Thor wants to wield it but Hulk goes instead as he's the strongest one and the stones emit gamma radiation according to him. He wields it and snaps his fingers restoring all life lost. Clint's wife calls him on mobile. Hulk suffers extreme pain in his right arm due to IG.
Past Nebula activates the Quantum teleporter and summons Thanos' warship and blasts the Avengers HQ to ruins with missiles.

Hulk lifting up rubble similar to Secret Wars cover where he lifts up a whole mountain except this is less in film lol.

Clint finds the gauntlet and is being chased by Outriders creatures in last film. He kills them and is met by past Nebula. Gamora and present Nebula meets up and Nebula kills her past self.

Cap, Tony and Thor teams up against Thanos. Thor is losing against Thanos even though he has Stormbreaker and Mjolnir. Thanos is about to kill Thor with SB when:

Cap lifts up Mjolnir and beats Thanos with hammer and shield.

Thanos uses his double blade weapon to break Cap's shield in half.

Thanos summons his whole army including the Black Order and some new creatures. Cap is all by himself against a whole army.

He hears Sam's voice and he turns around and see EVERYONE who has vanished PLUS huge armies of Wakandans, sorcerers and Asgardians (no signs of Warrior Three).
Wong, Valkyrie, Wasp and Pepper Potts as Rescue turns up as well.
Ant Man becomes Giant Man.

Clint plays American Football with IG and passes it to Black Panther then Spidey.
Quill meets past Gamora and gets hit in the balls, not believing he is the one she loves lol.
Scarlet Witch overpowers Thanos but Thanos orders missiles to hit everyone including his forces.
Captain Marvel shows up to destroy Thanos' flagship and gets the IG and dashes towards the goal.
There is a bit where Hope and Scott goes to the van with the Quantum teleporter in the middle of battlefield. Was lost in the moment so forgot why they doing that, sorry.

All female Marvel characters fight Thanos. Spidey's armoured suit goes autokill mode with the extra arms.

Thanos tries to take the gauntlet off Marvel by headbutting her but didn't phase her.

Thanos retrieves the gauntlet away from Stark and he snaps his fingers. Nothing happened.
The stones went to Stark and before he snaps his fingers, he says 'I'm Iron Man'.

White flash of light.

All of Thanos' forces turn to dust including Thanos himself.

Tony dies from using the gauntlet. Everyone mourns.

The battle is won but at a cost.

holographic Tony gives a message to everyone present including his daughter.

A wreath with Tony's chest reactor is laid to rest at the lake near Tony's hut.

Everyone is present including GOTG, Peter, Maria, Ross, Nick and Hank and Janet.

Thor, still fat designates Valkyrie as Queen of New Asgard in Tonnsberg. Thor is now travelling with GOTG to find Gamora and maybe more Asgardians. Quill and Thor is about to fight for leadership lol.

Scott, Cassie and Hope are together again. Wakanda is back with his King.

Cap goes on a mission to put back the stones and Mjolnir to their proper places. Hulk says to Sam and Buck that he should be back in 5 secs.
He didn't. Sam sees a old man at a bench and it's Old Man Steve (who looks like Clint Eastwood now but less wrinkles and bit younger than he is lol). Steve has wedding ring and passes his shield to Sam. Sam is honoured.

Ending shows young Cap dancing with Peggy at their house. That's it.

Credits music is set to 1930s music then shows all cast members. The main cast is shown with their signatures on it.

There is NO post credit scenes which is a first for a MCU. NOTHING, NADA!

Stan Lee cameo is set in 1970s where he is shown in his 70s younger self driving a car with a woman, driving past a army base where Cap and Tony retrieves the Tesseract there.

no sign of past Loki after he disappeared with Tessaract during Infinity Stone Time Heist, nor if present Loki is back or not.

No signs of Vision nor Black Widow.

Eric Selvig is one of the vanished, but does not appear in film according to actor.

Another important detail that makes no sense in the film in terms of continuity and the beginning of Endgame is that the sequence in mid credit scene of Captain Marvel film DOES NOT appear in Endgame