The Adventures of Tom Bombadil actual translation from the "Red Book of Westmarch", and contains some background information on the world of Middle-earth that is not found elsewhere: e.g. the name of the tower at Dol Amroth and the names of the Seven Rivers of Gondor. There is also some fictional background information of those poems, linking them to Hobbit folklore and literature and to their actual writers (some of them are ascribed to Samwise Gamgee). The book uses the letter "K" instead of "C" for the /k/ sound in Sindarin (one of the languages invented by Tolkien), a spelling variant Tolkien used many times
Frodo Baggins Ring of the Dark Lord Sauron, who desired to use it to conquer Middle-earth. Realizing that he was a danger to the Shire as long as he remained there with the Ring, Frodo decided to leave home, at the age of 50, and take the Ring to Rivendell, home of Elrond, a mighty Elf lord. He left the Shire with three companions: his gardener Samwise Gamgee and his cousins Meriadoc Brandybuck and Peregrin Took. They escaped just in time, for Sauron's most powerful servants, the Nine Nazgûl, had entered the Shire as Black Riders, looking for Bilbo and the Ring.