What Literary Devices are used in The Hobbit?
Foreshadowing is one that is used frequently. Personification... symbolism... imagery, analogy, metaphor, probably a little onomatopoeia.
Also similies, metaphors, theme, repetition and more
A literary device is also known as a literary technique. It is a specific device used by the author to get their message across. There are many resources available to help identify literary devices, especially the online literary device dictionary (literary-devices) which has in depth definitions, explanations and examples of a wide variety of devices used. Being familiar with these devices will make it easier to identify them within a text.