I love having almost all of the available accessory feet.
These are kept in a small plastic box with dividers and labels;
bi-level, bi-level right, braiding, candlewick, double cording, pearl piping, zipper, teflon, bias binding. Plus there is a circle foot that lets me sew circles or half circles which look pretty.
My all time favorite and every day stitching foot is a 1/4 inch w/guide. I bought spares just in case. Love the buttonhole foot too.
I am waiting to use the fringe foot to make the flower centers on a panel.
The serger has another box of dedicated machine feet; belt loop, curves, piping and more.
For the large walking foot, I use the 1/4 inch and SITD feet for attaching binding.
Give the girl an inch and she'll take a foot.