How to Turn Off Constant Water Supply on Toilet Commode (Wont Stop Running Spigot Shut-Off Knob FIX)

To stop a constantly running toilet, follow these steps:
Turn off the Water Supply: Locate the shut-off valve behind the toilet and turn it clockwise to shut off the water supply .
Drain the Tank: Flush the toilet to drain as much water as possible from the tank.
Inspect and Adjust the Components:
Flapper Valve: Check if the flapper valve is sealing properly. If it's worn out or not sitting correctly, replace it.
Float and Fill Valve: Ensure the float is not set too high. Adjust or replace the fill valve if it's malfunctioning.
Test the Toilet: Turn the water back on and flush the toilet to ensure the issue is resolved.
These steps should fix the most common causes of a running toilet, such as a faulty flapper, incorrect float level, or issues with the fill valve
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[@Ricobaca]

Where does the water come from? Can you explain and or show how a toilet fills back up after it's flushed. Not the bowl, that part you had your hand in.

[@HelpingHermit]

water comes from the fill valve, the long black tube on the left of the tank. The water is flushed emptied on the right where the flapper covers the hole.