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
Old Forest of the Brandybucks during the War of the Ring was Meriadoc Brandybuck: Merry of the famous Fellowship of the Ring. He had been into the Old Forest "several times", and he had a key to the gate. On Merry's advice, Frodo Baggins (the bearer of the One Ring) decided to attempt a traversal of the dreadful forest in order to evade the pursuit of Black Riders: the forest was considered the lesser of two evils. The Old Forest experiences of Frodo, Merry and their companions Samwise Gamgee and Peregrin Took (and their ponies) are detailed in "The Fellowship of the