Everything has a spot where it lives - For example, your keys have a home and they're either in their home or they're in your hand unlocking something.
Like with like - Organizing your belongings so that all like objects live together - not most of them ALL OF THEM! That means storing all tools in a tool box and not leaving a stray screwdriver in a junk drawer.
Keep a donation bag/box in your closet – Doing this makes it easy to thin out your closet and when the bag is full its ready to go!!
Something in, something out - Helps manage the number of items in a home. If you buy something new, something has to be donated, given away or trashed.