Captain America: Civil War (2016)
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In this film, there is no Superhuman Registration Act quite but the equivalent of the act is called the "Sokovia Accords" as it was triggered by the destruction of the city in Avengers: Age of Ultron (2015). It states that all superheroes will need to get approval to be deployed to the field after each event or activity has been reviewed or approved by the United Nations. The team members are broken down as follows.
Anti-Accords: Captain America, Scarlet Witch, Falcon, Winter Soldier, Hawkeye, Ant-Man, and Agent 13.
Pro-Accords: Iron Man, War Machine, Vision, Black Widow, Black Panther, and Spider-Man.
In the comic books, Tony Stark becomes the Pro-Registration figurehead, while Cap leads the Anti-Registration group, which is later known as "The Secret Avengers". Spider-Man is caught in the middle having differences with Iron Man, but also not wanting to go against the law. At first, he was convinced to join Pro-Registration by Iron Man and revealed his identity to the world. After Spider-Man assisted Iron Man in several missions (and witnessed a hero die as a result of the war along with a partnership with supervillains), he called it quits and switched to Anti-Registration with Cap. This was in addition to almost dying at the hands of Spider-Man comics villains Jack O'Lantern and the Hobgoblin, whom Iron Man was using in an effort to increase their numbers. It was not until the Punisher rescued him that he came to his senses. Promotional art of the film gave a first look at the teams. In the film, although Black Widow doesn't switch sides, she does at some point wind up willfully giving some of members of the opposite team a head start in fleeing her team's lawful attempt to arrest all of them, and toward the end, she explains her actions by presenting insubordinate philosophies to Stark. Likewise, Black Panther doesn't switch but at the end secretly provides harbor to the eventually-vindicated Winter Soldier. So, in a sense, Iron Man's support shrinks slightly, even if Cap's doesn't grow. Edit (Coming Soon)
The villains are Baron Zemo (Daniel Brühl) and Brock Rumlow/Crossbones (Frank Grillo). Crossbones is once again a supporting villain, just as in Captain America: The Winter Soldier (2014), having miraculously survived the collapse of the Triskalion, and blaming Steve Rogers/Captain America for the injuries he sustained. Baron Zemo is the main villain, although this is kept in the dark for a long time, and his true intentions aren't revealed until the end. "Bucky" Barnes, the Winter Soldier, (Sebastian Stan) starts out as a villainous character, but he becomes a close ally to Captain America later on. Similarly, T'Challa/Black Panther (Chadwick Boseman) starts out as rogueish, but also becomes one of the heroes. In some ways, Tony Stark/Iron Man (Robert Downey Jr.) and State Secretary Thaddeus "Thunderbolt" Ross (William Hurt) can be considered antiheroes. Edit (Coming Soon)
During the encounter with Zola (Toby Jones) in Captain America: The Winter Soldier (2014), Steve Rogers/Captain America (Chris Evans) learned that the death of Howard and Maria Stark was a hit ordered by HYDRA, who faked it as a traffic accident. At the end of the same movie, Natascha Romanoff/Black Widow (Scarlett Johansson) gave Steve a Russian file about Bucky Barnes/Winter Soldier (Sebastian Stan), saying that she pulled some strings with former allies to get it. The file was probably a KGB file, which could hold some clues to the Winter Soldier's current whereabouts. Since he was in the service of Russian HYDRA agents during the Cold War, the KGB may have been able to keep better track of his secret missions at the time (in Captain America: The Winter Soldier, Black Widow admits that her former Russian agency, as well as she herself, have had dealings with him). It is most likely that Steve read in (or implied from) this file that it was Bucky who executed the killing of Howard and Maria Stark; this would make sense, because if it had been explicitly stated in a secret S.H.I.E.L.D. or HYDRA file, then Tony Stark/Iron Man (Robert Downey Jr.) probably would have found out himself after Black Widow dumped all secret files on the Internet at the end of Winter Soldier. Even Baron Zemo said he had to do extensive decryption on a HYDRA file to find a clue as to what happened on the night when Stark's parents died. In any case, Steve withheld this vital piece of information from Tony, knowing that Tony would make it his mission to kill Bucky, even though Bucky was brain-washed and did not know what he was doing at the time. Edit (Coming Soon)
There are actually two post-credits scenes (or more accurately: a mid-credits and a post-credits scene). In the first, Steve Rogers/Captain America and James "Bucky" Barnes/Winter Soldier are given shelter in the secret laboratory of T'Challa/Black Panther. Bucky voluntarily goes into stasis, in the hope that they may be able to re-program his mind, so no one can take advantage of him anymore. In the second scene, Peter Parker/Spider-Man returns home after the battle, fooling his aunt into believing that his injuries came from a fight with a school bully. He then produces a piece of communication equipment from Stark, which also casts a Spider-Man logo on the ceiling. Edit (Coming Soon)
No. Captain America: Civil War is the third installment of the Captain America trilogy while featuring members of the Avengers minus the Hulk and Thor. It is not an Avengers film. Avengers: Infinity War (2018) and Avengers: Endgame (2019) are the third and fourth (last) Avengers films. Edit (Coming Soon)
This is explained briefly in the scene when Stark heads to the Raft, the prison where the heroes who sided with Captain America are imprisoned. Stark receives a message from his A.I. F.R.I.D.A.Y. stating that some facial prosthetis resembling Bucky Barnes' face was uncovered from Baron Zemo's hideout. This implies Zemo wore a facial mask to look like Bucky Barnes and deliberately walked past security cameras to be identified as Bucky, thus framing Bucky for the explosion. Edit (Coming Soon)