http://www.crutchfield.com/learningcenter/home/cables.html - seems to cover most of it.
Cheap audio Red/White, or red/white/yellow for audio with composite video, are unlikely to be matched impedance, though in a short cable matching is not as crucial as in longer runs. Bootlace cable with moulded connectors and no strain reliefs is not a sign of quality!
Higher grade red/white/yellow sets may use 75 ohm high frequency coax, an example I found.
They also have a component plus stero audio (5 RCA) bundle - wish I’d been able to find that style when I needed it, had to buy the video and audio cables seperate - much tidier as a 5 way.
There are 3 basic grades of cable:
The lowest grade is poor quality and possibly inappropriate type of cable, shoddiliy assembled. Often found in little hard to open plastic packets on a rack.
The next grade has impedance matched cable with adequate screening.
The final type emphasizes the perceived merit of whatever feature the manufacturer is plugging, but is extremely poor value compared to competent examples of a standard cable.