ok
1. Harry Potter and the Philosopher's stone. This is about when Harry is first introduced to Hogwarts and meets Ron and Hermione, and of course there's some darker stuff in there too but they are all so cute!
2. Harry Potter and the Chamber of Secrets. The plot is that somebody is out to get Harry. First he cannot get through the barrier to platform 9 and 3/4, and then people in the school start becoming petrified. Very funny in places though.
3. Harry Potter and the Prisoner of Azkaban. Sirius Black has escaped from Azkaban prison and is out to get Harry. What Harry doesn't know is why. (there's a different Dumbledore from this one)
4. Harry Potter and the Goblet of Fire. This is my favourite one. Think Hunger Games but darker. Harry's name is put into the Goblet of Fire as an entry for the Triwizard tournament. He swears he didn't do it, so who did?
5. Harry Potter and the Order of The Phoenix. Harry is still recovering from the previous film, and definite changes are afoot at Hogwarts. The ministry are presenting it as a positive change, but are their motives more sinister?
6. Harry Potter and the Half Blood Prince. My least favourite because there's more romance then plot. Ron has an admirer, and Harry is on a mission to find and destroy Horcruxes with Dumbledore.
7. Harry Potter and the Deathly Hallows pt 1. Harry Ron and Hermione find themselves in danger when Deatheaters attack a wedding, and must go on the run to continue to destroy Horcruxes, all while avoiding being captured.
8. Harry Potter and the Deathly Hallows pt 2. Harry is more determined then ever to destroy Voldemort, but Voldemort's onto him and takes measures to slow him down or stop him completely.
Hope to have helped