Do you have a sewing notebook? I have one I keep close at hand by my sewing table.
It contains all sorts of sewing related things that I pick up and want to keep notes on. For instance, there's a needle chart because for some reason I learned sewing machine needle sizes in the European sizing and used to not remember the American equivalent.
Back when I made a quilt with appliques I liked my satin stitch settings, so I wrote them down on a page along with the a note that it's for my Elna. I also took the practice piece I was using and clipped it on the page. I wrote down the zig zag setting I used for decoration over the satin stitch too. And a note of what fusible backing I used on the applique along with the fact that I didn't like it and the reasons why. This is a page describing the quilt:Because I can never remember what length and width settings I like for certain stitches, I sat down one rainy weekend and tried lots of them out. I took the fabric and wrote the settings beside each section and stapled that in my book. Now when I need a scallop edge I can reference my notebook and decide what settings I need. Before my book gets any bigger I think I'm going to transfer a lot of things to an actual notebook instead of the little composition book it's in. I'll even add dividers.