Canon
In the Hebrew Bible, Ruth is prefaced to Psalms as ending with the genealogy of David, though in the Middle Ages, it was moved to a later position alongside the other short books (Song of Songs, Ecclesiastes, Lamentations, and Esther).
(The Origin of the Bible: Newly Updated by F. F. Bruce, J. I. Packer, Philip W. Comfort, and Carl F. H. Henry, 2020. The Canon of the Old Testament by R. T. Beckwith. Pages 57.)
Literary Form
Ruth resembles a hero story. It's a love story that celebrates Ruth's domestic and religious heroism.
(The Origin of the Bible: Newly Updated by F. F. Bruce, J. I. Packer, Philip W. Comfort, and Carl F. H. Henry, 2020. The Bible as Literature by Leland Ryken, Page 131-132)
Time Period
After Judges. Ruth 1:1, "in the days when the judges ruled."
(The Origin of the Bible: Newly Updated by F. F. Bruce, J. I. Packer, Philip W. Comfort, and Carl F. H. Henry, 2020. Biblical Languages by Larry Walker. Section One: The Authority and Inspiration of the Bible. Page 6)