In the book and movie The Hobbit the main character Bilbo Baggins is an Adventurer at heart, but hadn't discovered that until the Wizard Gandalf persuaded him to come on the adventure of a lifetime. The movie strays from the quite a bit from the book but did not disappoint. The same plot is held between the movie and book which is Bilbo is recruited as a burglar to help kill the Dragon Smaug. The movie and book are similar in many ways but the movie changes important things.
First of all, a major character in the movie is barely even mentioned in the book. His Name is Azog The Defiler. He is the most important enemy from the first part of the movie. In the book though he was killed years ago and his son is one of the main adversaries but is only seen at the end in The Battle of the Five Armies. Which he is slain like his father in battle.
One major scene that has changed is when Thorin Bilbo and Company Arrive and leave Imladris (Rivendell) they have completely different feelings about the elves. The Dwarves didn’t want to leave in the book because they were so tired and hurt. In the movie they snuck out in the middle of the night trying to evade the elves. Same thing when they arrived they were greeted with spears in the movie but in the book they were greeted with songs and laughter.
The attitudes of the dwarves and Bilbo were angry when they had to leave because they were well fed and safe in Imladris. The movie they were hostile at the elves because they didn’t help them years ago when Smaug the dragon killed most of their people and invaded their home. They had no love and gave no thanks to the elvs in the movie but they said they couldn’t thank them enough.