Destroy the horcruxes
Yes, he does kill Lord Voldemort in the end of Deathly Hallows.
Lord voldemort is the person who killed harry's parents and he is now seeking to kill Harry
Lord Voldemort's death eaters didn't kill him because they were his followers, they believed in what he was doing and thought he was right. They didn't kill Harry Potter because Lord Voldemort specified that he must be the person who killed Harry.
Voldemort killed James with the Avada Kedavra killing curse.
Harry potter kills Voldemort ( aka "you know who" or the dark lord or He Who Must Not Be Named
Yes, Ron destroyed one of Lord Voldemort's Horcruxes - killing a piece of his soul.
He himself is not a book; Lord Voldemort is a character in a series of books titled "Harry Potter." He is the antagonist trying to kill Harry.
Book 7
The killing curse, Avada Kedavra.
In the great hall at Hogwarts.
He used the killing curse.
No, Neville didn't kill Voldemort, Harry did - but he did kill Nagini, Voldemort's snake which was the last remaining Horcrux.