How many times have you started a book in a series only to realize you don’t remember what happened in the previous book?

For me it has been happening far more than usual so I’ve decided to make a post recapping what happened in a book. Also I was watching “The Vampire Diaries” and I love the way they say “Previously On The Vampire Diaries”. (Be still, my Nian- shipping heart).
Usually I use Wikipedia for this however Wikipedia doesn’t have all the YA or Historical Fiction that I read.
So I am starting a new series called “Previously On” which does a quick review on what happened in the previous book.