The 'Harry Potter' series by J.K. Rowling is an excellent choice. It's full of magic, adventure, and well - developed characters. You'll be immersed in the wizarding world from the first page.
For science - fiction fans, the 'Foundation' series by Isaac Asimov is excellent. It presents a grand vision of a future galactic empire and the science of psychohistory. Also, the 'Dune' series by Frank Herbert is set in a far - flung future with complex political and ecological systems.
Well, 'The Foundation series' is a classic in science fiction. It's about a group of scientists trying to save civilization in a collapsing galactic empire. 'The Twilight Saga' is a well - known series, which tells the story of a girl, Bella, who falls in love with a vampire. Although it has some mixed reviews, it has a large following. 'The Discworld series' by Terry Pratchett is also excellent. It's a satirical take on various fantasy and real - world elements, set in a flat world on the backs of four elephants standing on a giant turtle.