My kitty runs in and out of the house so much, and falls deeply asleep while in the house so she doesn't always hear my calling for her. I made an IN and OUT sign to remember where my kitty is!
I just printed two pics of her (one IN the house and one OUT, obviously), added some text, looped a piece of yarn between them and glued them together. It hangs on a hook by my back door. I flip it when she comes in or out.
You could also do this for laundry or dishes in the washers or not or anything else you might need to remind yourself of.
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If you plan on having a pet cat and want it to be an outdoors cat, be prepared for it to come scratched or harmed by other cats. You should have a first aid kit for just in case because your cat is bound to get into some trouble.