<human>:  What is the best way to fix a running toilet?
<bot>: The best way to fix a running toilet is to first assess the problem. This can include checking the water level in the tank and ensuring that the flapper valve is closing properly. If the water level is too low, you can adjust the float arm to raise the water level. If the flapper valve is not properly closing, it may need to be cleaned or replaced. Finally, if the problem persists, you may need to replace some of the internal parts of the toilet, such as the fill valve or the flush valve.