So much more than just bravery and courage, but those are big parts.

The Hobbit - Yearning for adventure, exploration, and accomplishing something bigger than oneself. Revenge.

LotR - Impossible odds. Teamwork. Paradigm shift to Middle-earth primarily for Men. Completing a grand task.

Other Middle-earth stories - too vague to cover.

I'm sure others can think of much more.

The Silmarillion - a set of historical events which involves the beginning of creation, that encompasses the subjects of good vs evil, life and death, fate and morality, the sufferings of life, unconditional love, the nature of evil, hope vs despair, God vs the Devil and many other themes based on Christian concepts.