The 8th episode of WandaVision title “Previously On”, does exactly that, in flashback it shows parts of the life of Wanda and Agatha Harkness.
First, the Marvel Studios logo is in purple, to give respect to the revelation of Agatha Harkness, after that a little history lesson on how Agatha started as a powerful witch.
The episode starts with a witch trial in Salem, but not that kind of a witch trial, when Agatha is asked “Are you a witch?” , the correct response is Yes.
The brooche that Agatha wears all the time and the moment she gets a hold of it.
So, Agatha traps Wanda in her basement chamber protected by runes.
It is time for the memory lane trip for Wanda.
As kids in Sokovia with her brother Pietro. It is revealed why Wanda has a fondness for sitcoms.
Jumping to a teenage Wanda in Hydra, where Wanda interacts with the mind stone for the first time, and for a second we can see The Scarlett Witch in that interaction, which might mean that it is the moment Wanda became destined to be The Scarlet Witch.
One memory with Vision is shown in the Avengers headquarters.
The next scene is just before Wanda creates the hex in West View.
After not managing to get Vision’s body from S.W.O.R.D., Wanda drives of and goes to West View where she has a deed for a house estate.
Bonding time is over, time for battle:
