I have a notebook. I write the name of the pattern- if using one, or the theme, who it’s for, what it is going to be. I sketch, I cut swatches of fabrics. I put down the name of the batting, what ever details. I make notes as I progress.and I include a photo of the finished quilt. Date of completion & what I put on the label.
Some are more involved entries, some just a little bit.