First things first, if you have watched Dr. Strange in the Madness of the Multiverse (which I thought was much better expected, and starred a LGBTQ+ character), but have not seen WandaVision, I encourage you greatly to watch all of WandaVision. WandaVision is a shining example of don’t judge a book by its cover (or a show by its first episode). I watched the show after seeing the second Dr. Strange movie, as the movie references events that occurred in WandaVision. Having now finished the TV series, it certainly did help fill in the gaps, especially as to why Wanda became the all powerful and villainous Scarlet Witch.
If you’re not familiar with all the Avenger Movies, Wanda lost Vision (whom she considered her soulmate), twice. The first because she killed him in hopes to prevent Thanos from obtaining Vision’s mind stone. The second time? Killed by Thanos, as he reversed time (thanks to the time stone given to him by Dr. Strange) to restore Vision then rip his mind stone out. So, to boot, WandaVision begins as a shrouded mystery, since Vision is miraculously alive. Real story is, Wanda is severely traumatized and is hiding in a fantasy, specifically sitcoms from the 50s to modern day.