What is the BEST type of fire extinguisher for use on most general shop fires (wood, paper, electrical, flammable liquids)?

FIRE CLASSES (US system): CLASS A is ordinary combustibles (wood, paper, cardboard, fabric, most plastics); CLASS B is flammable liquids and gases (gasoline, oil, grease, alcohol, propane); CLASS C is energized electrical equipment (electrical fires need non-conductive agent; once de-energized, the underlying fire is usually Class A or B); CLASS D is combustible METALS (magnesium, titanium, sodium, lithium; require special agents like sand, special powders); CLASS K is cooking oils and fats (commercial kitchens; special wet chemical agents). FIRE EXTINGUISHER TYPES: ABC DRY CHEMICAL (red, with ABC label) is multi-purpose; most common in homes, shops, vehicles, offices; uses monoammonium phosphate powder; effective on Class A, B, and C fires; leaves residue that can be corrosive and damage electronics. BC DRY CHEMICAL (sodium or potassium bicarbonate) is for B and C only; less residue than ABC. WATER (Class A only) — DON'T use on electrical (Class C) or grease (Class B); spreads flammable liquids; energized electrical creates shock hazard through stream. CO2 (carbon dioxide) is for Class B and C; gas displaces oxygen, smothers fire; LEAVES NO RESIDUE — good for electronics, lab equipment, server rooms; less effective on Class A; loud discharge; doesn't cool sufficiently to prevent re-ignition; cold can cause frostbite if directed at people. FOAM is for Class A and B; smothers and cools; good for flammable liquids; not for Class C electrical. WET CHEMICAL (Class K) is for cooking oils; converts hot fats to non-flammable soap (saponification); commercial kitchens. CLASS D extinguishers use sand, sodium chloride, copper powders for metal fires specifically. EXTINGUISHER USE — PASS technique: P — PULL the safety pin; A — AIM at the BASE of the fire (not the flames; the fuel is at the base); S — SQUEEZE the handle; S — SWEEP side to side, advancing toward the fire. EXTINGUISHER SIZES: rated for fire size (numerical rating before letter — e.g., 2A:10B:C means it can extinguish 2 units of Class A and 10 units of Class B). Home/shop minimum: 2A:10B:C; preferred 3A:40B:C; commercial larger. WHEN TO USE vs EVACUATE: use only on SMALL FIRES (one trash can-sized maximum); PEOPLE FIRST — evacuate everyone before considering firefighting; KNOW YOUR EXIT — never fight a fire with the fire between you and exit; CALL 911 first (or immediately while someone uses extinguisher); if fire is large, spreading fast, or blocking exit — evacuate and call fire department; most extinguishers discharge in 10-20 seconds — limited time; if fire not out after one extinguisher discharge, evacuate. Stay 6-10 feet from fire when using extinguisher. FIRE PREVENTION in shops: eliminate ignition sources; proper electrical (no overloaded circuits; quality cords/outlets; GFCI); store flammables properly (METAL CABINETS for solvents, paints, fuels; flame-resistant containers; ventilation); housekeeping (sweep sawdust regularly); SOLVENT-SOAKED RAGS spontaneously combust as oil oxidizes (store in self-closing metal containers; never pile in trash; dispose properly); no smoking in shop areas; working alarm systems (smoke and heat detectors); clear exits; flammable storage separated from main work area; welding/grinding (clear flammables 35 plus feet; fire watch in place). SMOKE DETECTORS: every shop should have working smoke detectors; CO detectors near combustion equipment; check batteries regularly.