What goes in a work out log?

Hey! !! Ok i know what goes in os how much you lift, but more detail please. :) Im a lady lifter, i bootybuild, so i focus mostly on my lower body. Anyways can someone help me start one. Or give me an example of thiers. I see all these bodybuilders with thier notebooks but i dont want to interrupt their work out with qquestions . Thank you!!? Also food book? Lol idk. Thanks.