So, I just spent some money on some sewing machine feet.
My sewing machine is an Elna Lotus from the early 1970s. It's older than me. My mom sewed kid's clothes for me and my siblings on it. It's a travel machine: really portable, doesn't take up a lot of room.
It works well with some fabrics, especially wovens. Knits … not so much. And it's not the strongest; I have run into the limits of how many layers it will sew through on occasion.