Cables are a critical component of any audio system. There are mainly two types of audio cables available in the market; balanced (two signal wires and a ground wire) and unbalanced (one signal wire and one ground wire). Signals in all types of wires are conveyed by the combination of voltage and current. Reducing analog audio noise is an issue primarily with longer cables, or in professional/broadcast or preservation environments, so those systems use balanced signals for that.
Here is a video collection on audio cables. They describe basic components of audio cables, types and how it affects the audio signal. The videos are concentrated on cables used to carry analogue audio signals.
Basic Guide to Common Cables | 2 Minute Tech Tips
Understanding Audio Cables & Connectors
How to make-wire SpeakON cables for PA speakers
Using Audio Adapters | The 5 things you must know
INTERFACE – Tips Tricks and How-To – Audio Cables and Connections
#003 Soldering Tutorial – How to make pro grade cables!
Rolling microphone cables correctly
Balanced Audio vs. Unbalanced Audio Signals – Understanding how they work.
Stage Left Audio – Snake Splitter