A lot of the minutiae surrounding plumbing and the like would be relatively hard for you to conceive of until and unless you have acquired several years of experience by being a full on member of the plumbing community. That said, there are certain plumbing elements that you are probably already aware of in some way, shape or form, even if you might not know what their actual terminology or name might be at any given point in time.
For example, virtually everyone has used plumbing fixtures at some point over the course of their lives. Most plumbing services offer to fix your fixtures at a low cost, and a big part of the reason why that is the case has to do with the fact that they are the least complicated aspects of your system in general. A plumbing fixture is basically any part of your plumbing system that actually emits water and enables you to use it for a wide range of purposes. Your bathroom faucet is a fixture, as is your showerhead. Your washing machine is not a fixture though, because it has a direct connection to the water line that is slightly more difficult to work with.
Fixing your plumbing fixtures on your own is something that you can most definitely end up aspiring to. It’s something that is somewhat simple since you can take a fixture off and put it back on with a relative amount of comfort and ease. Plenty of people are starting to take a more hands on approach in that respect, and that allows them to take more control over the plumbing that they can use on a day to day basis.