Kneel down and look under your sink. You’ll see two or three metal braided hoses (they look like fancy snakes) running up from the floor or the wall to your faucet. Each hose has a little valve—one for hot water (usually on the left) and one for cold (on the right). If you have a sprayer, there might be a third, but ignore that drama for now.
Pro tip: If you can’t see them because of a towering fortress of cleaning sprays, just clear the cabinet with the fury of a person who truly needs to stop a leak. You are a treasure hunter, and the treasure is dryness.
The Handle Situation
Now, look at the handle on each valve. Some are little levers that look like tiny runway gates, and some are round knobs that demand to be twisted. The handle will be parallel to the pipe (water flowing) or perpendicular (water blocked). If it’s a lever, treat it like a switch: turn it 90 degrees until it crosses the pipe.
How to Turn Off Water Under Your Sink (Kitchen & Bathroom) | Checkatrade
If it’s a round knob, you’ll turn it clockwise (righty-tighty) until it stops. Don’t Hercules it—if it’s stuck, give it a gentle love tap with a wrench or a shoe. Surprising fact: You are now a human plumber, and humans have been doing this since the Romans invented indoor plumbing. You are literally continuing a 2,000-year-old tradition.