The Hobbit's main themes are the definition of heroism, the consequences of greed, and the longing for home.
J.R.R. Tolkien describes the struggle of good versus evil in The Hobbit by creating a fantasy world complete with settings, creatures, and magic. The conflict in the story is provided by forces of evil such as goblins and dragons. Bilbo, the hobbit, represents goodness through his heroic qualities. It is his responsibility to ensure that good triumphs over evil.
The theme is emphasized in the episodes in which Gandalf, the dwarves, and Bilbo battle the many terrors of Middle Earth. Battles with goblins, trolls, wolves, and the Battle of Five Armies demonstrate that good always triumphs over evil. The trolls are the first to appear.
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