Hawking

Hey guys, so I read A Brief History of Time many moons ago, before I drove off this cliff. My retrograde amnesia is limited to books and movies, mainly, so it is like reading everything for the first time. Luckily, it is no longer at the end of each sentence!!
I can’t help but wonder, who here has read it before? I had a basic understanding of astronomical terms and I am quite good with the English language. Thus far, I feel I have a good grasp of the book.
Are there concepts anyone failed to grasp that someone filled you in on? Inquiring minds want to know!