Academically:
* Languages: He was a renowned expert in Old English, Middle English, and other Germanic languages. He taught these languages and studied their history and evolution.
* Literature: He taught courses on Old English literature and medieval literature, exploring themes of mythology, folklore, and epic poetry.
* Linguistics: His work on language creation influenced the field of linguistics, particularly the study of constructed languages.
Through His Writings:
* Mythology and Folklore: Tolkien's works are deeply rooted in mythology and folklore, particularly from Anglo-Saxon and Celtic cultures. He explored themes of good vs. evil, heroism, and the power of stories.
* Language and Culture: Tolkien created entire languages, such as Quenya and Sindarin, which brought to life the fictional worlds he imagined. He emphasized the connection between language and culture, arguing that language shapes how we perceive the world.
* Nature and the Environment: Tolkien's works are often filled with descriptions of nature, emphasizing its beauty, power, and importance. He explored the relationship between humanity and the natural world.
* Moral Values: Tolkien's stories often explore themes of courage, loyalty, sacrifice, and the importance of fighting for what is right.
Beyond His Writings:
* Imagination and Creativity: Tolkien's works inspired generations of writers, artists, and musicians, encouraging creativity and the power of imagination.
* The Power of Storytelling: His emphasis on the importance of myth and legend has impacted how we view storytelling and its power to shape our understanding of the world.
It's important to note that Tolkien himself didn't explicitly set out to "teach" these things. Rather, his work explored these themes and ideas through his own unique lens, leaving readers to interpret and learn from them. He was, however, deeply invested in the power of language and storytelling, and his work reflects this.