There are exactly four novels in Twilight. They form a complete saga that follows the romantic and supernatural adventures of Bella and Edward. Each book adds new layers to the story and keeps readers engaged throughout.
Well, there are four novels in the Twilight series. They are Twilight, which introduces us to the characters and their world, New Moon with its ups and downs, Eclipse that adds more drama, and Breaking Dawn that brings the story to a climatic end.
Well, the number of books in a novel series is not fixed. Some series wrap up quickly with just a couple of volumes, while others keep going and going. You'd have to look at the particular series you're interested in to know for sure.
The number of books in the Safehold series varies depending on how you count. Generally, it's around eight or nine. Different editions or compilations could affect the count.