Kathi Burns does an excellent job of providing helpful strategies for sorting items and deciding what to keep and what not to keep.
To make it easier to tackle one space at a time, she devotes a chapter to each room in your house or apartment, and even tackles the attic, garage and basement.
She really does a number on the kitchen, with extra information about organizing drawers, the refrigerator, dishwasher, pantry (if you're lucky enough to have one), plus a baking zone, a homework zone, and even a breakfast bar and lunch zone.
The graphics do a good job of picturing how to take advantage of her suggestions.
I don't play tetris; but for those who do, there is plenty of information about how to play that game.