The quality of the house's plumbing is very important for the comfort of the family. If the plumbing is working properly, water flows from the faucet, the family can wash and the radiator can be heated if necessary. Once the pipe is broken, there is a real problem. This can call for a plumber and can usually be expensive.
Plumbing is a profession for experts. Unless someone in the household knows about plumbing, it is best to call a plumber for any work that needs to be done. That's why it pays to have a contact number with a competent installer on hand. However, there are some plumbing jobs that an amateur can do as long as he knows how to do it first. You can't execute plumbing work without knowing about it; hence you need to know about it to become a water system engineer.
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You may need to turn off the water supply using an external shut-off valve. Of course, you need to know where the stopcock is. If you're not sure, contact your water company to find out where it is. Then all you have to do is remove the cap, put the key on the stopcock, and turn it clockwise.
Turning off the water supply is essential if there is a leak in your property. If you have the skills to fix a leak yourself, move on. If not, contact a plumber immediately. Insurance is available to cover plumbing costs, and it's a good idea to get it for any unavoidable emergencies that may arise from time to time.