A fixture refers to anything in a home that has water flowing to it. A toilet, a sink, a hot water tank, a dishwasher, a bathtub; these are all examples of plumbing fixtures. Plumbers know the importance of keeping our fixtures operating like they should. Blockages, clogs, back flow issues and drainage are all things that a garbage disposal at fixing on a daily basis. Water not moving around as it should poses problems in all areas of a home. Having an issue with water leaving your home can be disastrous as water finds its own level and will back up and possibly spill out, causing a major mess and potentially a lot of damage. Water not going into your home properly causes problems within the pipes and then in turn within the appliances and fixtures that use that water to operate.
When you get to the house stand if front of the toilet and locate the water shut off valve. Should be down below the toilet on the wall. Just turn it off (righty-tighty) completely and flush the toilet. All the water should have left the tank, well at least most of it. If there is remaining water line repair get it out with paper towels or a rag. The important thing is that no more water came in. If it did then your valve is not shut all the way or not working and you need additional help.
One other common design that is considered "washerless" was made famous by Delta and copied by several other makers. It uses little "cup" seals that fit over springs recessed in the back of the valve body. The springs press these "seals" against the cartridge and regulate the flow through little tapered openings in the cartridge. If you have one of these and it's dripping, changing these springs and seals will usually correct it. Here's a tip. Once you have the cartridge out of the way, insert a phillips screwdriver into the seal and pop both the seal and spring out. Stick the new ones on the end of the screwdriver to help guide them into place. This is especially helpful if you don't have long slender fingers.
The next step in this process is to determine what type of method is available for fixing the problem. You cannot just caulk a crack or fill it in with cement and hope for the best. Unfortunately, there is more work than this because you have to fix the problem from both the inside out and the outside in. This takes a professional in most cases to determine the best method for repair.
As with anything, when you are not sure how to fix a plumbing issue and when you don't have the proper equipment, you should contact a professional. They can usually find out what the problem is and resolve it for you in a short period of time. They will also be able to tell you if you have any other problems and water line repair they can suggest resolutions.
The way a toilet plunger works is by filling up with water and then pushing that water through the stopped up drain. When unclogging a clogged toilet, the idea is to plunge up and down a couple of times so the plunger fills with water and then jam the open end, sometimes called a force cone, into the waste outlet in the plugged toilet and start plunging. You may have to pump the plunger up and down several times to clear the blockage.
The plumber you hire does not normally do heating but will do hot water heating or in floor heating in the house. Some places you can use the water heater for both domestic hot water and for in floor heating if the heating is a secondary heat. Check with your local plumbing codes on this to be clear.