what themes does it discuss?
Many themes like :-  a reversed quest, the struggle of good and evil, death and immortality, fate and free will and the addictive danger of power.
The Lord of the Rings
Scholars and critics have identified many themes in the book, including a reversed quest, the struggle of good and evil, death and immortality, fate and free will, the addictive danger of power, and various aspects of Christianity such as the presence of three Christ figures, for prophet, priest, and king, as well as elements like hope and redemptive suffering. 
where did tolkien write lord of the rings 20 Northmoor Road in North Oxford. what genre does it come under? High fantasy works. when was it published? The Fellowship of the Ring - 29 July 1954, The Two Towers - 11 November 1954 and The Return of the King - 20 October 1955 in the United Kingdom.
wiki:19676162
The Lord of the Rings [SEP] Themes
Scholars and critics have identified many themes in the book, including a reversed quest, the struggle of good and evil, death and immortality, fate and free will, the addictive danger of power, and various aspects of Christianity such as the presence of three Christ figures, for prophet, priest, and king, as well as elements like hope and redemptive suffering. There is a common theme throughout the work of language, its sound, and its relationship to peoples and places, along with hints of providence in descriptions of weather and landscape. Out of these, Tolkien stated that the central theme is death and immortality.