Obviously some john green stuff. Seven realms series is good. Its fantasy with princesses and wizards and that sort of stuff, but its really well done, and the characters are awesome. Going along with fantasy, Dragon Riders of Pern series is good, its about dragons/dragon riders. Its kind of old.
Gone series is good if you dont mind gory stuff. Its an end-of-the-world type book. Also, if you like end of the world books read the Life As We Knew It serries. They are really dark as well, but I enjoyed them greatly.
Some popular book series are Hunger Games (i liked the first one the best), Percy Jackson/ Heroes of Olympus, Mortal Instruments/ Infernal Devices, Eragon, Warriors, Harry Potter, Twilight (i've never read them, but although theres a lot of haters ive heard they arent half bad).
If you're into classic literature and stuff, i just finished reading Twelfth Night, one of the shakespeare plays, and thought it was magnificent. Also, Great Gatsby, Catcher in the rye, A separate peace, and catch 22 were all good reads.
And i guess ill include science fiction- Enders game. Love that book, the science stuff is awesome. And Ark. More of an adult book, but also very sciencey and awesome.
Also, i've heard Sarah Dessen is a really good author. Ive never read any of her books because thats the genre i like to call 'teenage girl books' (is just like realsitc fiction type stuff), but if you like that kind of stuff shes a good autor. Also, the book 13 reasons why (i dis read that one) is another good one from that genre.
I think thats enough books for now
