The Short Answer
The most effective small kitchen storage solutions: pull-out shelves in base cabinets make deep cabinets fully accessible; wall-mounted open shelving adds storage without cabinet volume; a magnetic knife strip frees up drawer space; under-cabinet mounted items (spice racks, paper towel holders) free countertop; corner units (lazy susans or magic corners) maximize wasted corner space; and adding a small cart or rolling island adds counter space and storage that can move when needed.