Thirteen years after the premiere of The Fellowship of the Ring, the Lord of the Rings film saga came to a close in December with the last installment of The Hobbit. You can now watch the entire story from start to finish, but even after watching the extended editions of each and every film, you’re still probably going to have a few questions.

DON’T MISS: Here are all the great new movies and shows you can stream on Netflix this week (Feb. 8 – Feb. 14)

That’s where YouTube user CGP Grey comes in. We featured his last Lord of the Rings explainer video as well, which covered the general mythology of Middle-earth and its fantastical races, but this time he’s decided to focus specifically on The One Ring, the magical item around which the entire series revolves.

If you ever wondered why the ring’s powers seem relatively limited, why there are so many other rings and why a hobbit was chosen to destroy the ring, you need to watch the full video below.