If you have to go somewhere, and need to have something with you,
don’t put it by the door.
put it in the car instead.
I have walked past my take-with-you pile so many times. I’ve even stepped over it. Obviously this is if you are driving to your destination and the item isn’t perishable.
When you arrive at your destination, it is so much better to say, “Be right back, I left it in the car.” vs. “Ugh, I forgot it at home.”
*Grammar edit: This tip would work well for a book, not “…isn’t perishable, like a book”.
Put the rings you can’t remember on top of the things you’re used to grab. For instance. If you remember to take your headphones or car keys, put that letter you have to mail next to it. If it’s too big, put a note attached to it. I have a post it that says lunch that I put on top of my back pack before I leave for work.