1. Determine the location of water shut-off valve
The main water shut-off valve is usually in the basement or on an outside wall in a utility area of the house. It's noticed that this valve can be seen as the most important valse which allows water flowing through the pipe when it is opened. If homeowner find any serious leaking point or broken pipe, turning off this valve is the first step you need to do before calling a professional plumber.
2. Know how to use Plumber's tape correctly
Plumber’s tape (also called Teflon tape) is used to seal pipe threads to prevent leaks around joints and fittings. You should typically wrap plumber’s tape three times around the pipe threads before sealing. Also note that white tape is designed for common household plumbing projects, while yellow is for gas line connections. Here are right steps to use this kind of tape
Clean the male threads at the end of the pipe with a clean rag.
Place the end of the plumber's tape on the second thread from the end of the pipe and hold it in place with a finger or thumb. The tape should lie flat (not bunched up) over the threads and extend perpendicularly to the length of the pipe.
Begin wrapping the tape around the pipe in the opposite direction to the direction the pipe will be turned.
Maintain tension on the tape so it wraps snugly around the pipe. Work away from the end of the pipe, overlapping the tape as you go.
Complete four to six wraps around the pipe, finishing near the end of the threads (opposite the end of the pipe).
Break the tape from the roll by gripping it between thumb and forefinger and pulling sharply; it breaks easily. Smooth the loose end down over the threads. The pipe is now ready to go into the fitting.
Source: The Spruce
3. Don't make Over-Tighten Fittings
If you try to screw plumbing fitting too tight, the risk of leak can increase due to warping the rubber seals inside the pipes over time. Remember this adage: “hand-tight is just right.”