harry potter and the goblet of fire

I think this book was a second step for reading books as this was the longest book for me. In this book as everyone knows the main character Harry potter overcomes all those obstacles in this match named 'Triwizard tournaments'. First stage of this match between 3 schools were to get the golden egg from dragons which were overcome by using broomstick magic. For the second match he got help from his friend Nevile who got help from Professor Moody who was actually the son of head of magic's minister. He (son of head of magic's minister) actually followed Voldmort and he succeeded to pretend like he tried to help Harry. But then his real identity was discovered when he was trying to kill harry and sent to Azkaban. For the final match (the match's goal was to find and get the prize faster than others) Harry potter (he was chosen illegally by a person who pretended to be a Professor Moody) and Gregory were transported to place of Voldmorts' family grave when they finally got the prize together. After he overcame his fight with Voldmort with the help from dead people's soul (including his parent's) he finally gets back to Hogwart with a Gregory's corpse. I think this book was interesting because unlike other series of Harry potter books it is showing competitions which are always exciting even though rarely some get hurt. However I hated a part of story when Harry potter and Ron fought even though it was natural that friends fight.