Avengers: Endgame's backstory encompasses a lot. It ties together the loose ends from previous installments, showing how the heroes were affected by past battles and how they prepared for the ultimate showdown with Thanos.
Sure is. The movie draws inspiration and elements from the rich world of Marvel Comics, specifically those related to the Avengers and their adventures.
Avengers: Endgame wasn't initially a comic. It was a highly anticipated and spectacular movie that capitalized on the popularity and rich history of the Marvel Comics. While it may have shared similarities and concepts with the comics, it was a standalone cinematic creation that thrilled audiences worldwide.
It's not straightforward to say she was evil. The Scarlet Witch's behavior in the comics was influenced by many factors, and her intentions weren't always malicious. Sometimes her powers caused unintended consequences that were seen as negative.