Good find. Personally I use a spreadsheet to keep track of all car maintenance in one place. Some of my friends have little notebooks that they keep inside each car. Some use stickers like these. I know one older guy who uses a yellow grease pencil and he writes the oil change date and mileage on the underside of the hood or on the front cross bracing or plastic shrouds or engine covers.
Trip "B" odometer for oil, but I do keep the window sticker for tire rotation reminders. Places like Advance Auto and Oreilly's keep a roll of those stickers by the oil supplies so you can grab a few for free.
I use stickers on friends or family cars but not on my own because it has an OLM. Although in the past when I had older vehicles I did use stickers on my own.
I did use FORScan to reprogram my OLM for 1 year/10k miles instead of the 6 months/7.5k miles. It’s still intelligent/variable based on conditions it just calculates it based on the new numbers I chose.
Grease pencil on masking tape under the hood: mileage, date, brand of oil. Date is most important because due to being retired and Covid, I don't put that many miles on my three cars, so it's once a year for oil changes.