Electricity and electronics (tubes!) and I go way back before cars...no license required!
A very nice intro article. I'll send it on to my car buddies.
My nickel's worth...
The "ground" wire in your house wiring is a safety "alternate" path for "stray" electricity to flow during a fault condition. It is the preferred route, rather than going through YOU, when things go wrong. As such, it normally has NO electrical current flowing. Your TV, drill press, refrig all work fine without this "ground". Its more proper name is EARTH GROUND..
The "ground" in your car is completely different. It is a CHASSIS GROUND. It is one half of every complete circuit in your car.. When any device is "on", there is current in the "chassis ground" connection for that circuit. In other words, the big piece of metal that is your car chassis is replacing the (negative for most of us) wire in the DC circuit. Saves money, weight, time, space, whatever.
So, who cares?
It's been my experience that mixing up of the 2 ground concepts leads people to think that the ground strap, say, to your engine from the chassis, is not important...."it's just a ground" (hint....beware of phrases using "just"). This means that ground wires are often overlooked. I've seen oem pieces on 40 year old cars, crumbled and corroded,especially if you autopsy one and cut it open....green dust instead of orange copper inside. This goes for all grounding cables....just replace them every 15 years. They're cheap, and more accessible that throttle cables.
Corrosion
Wire brush all connections with wires the size of your pinky. Put copper antisieze or other anticorrosion paste on these when you reassemble.
If your car uses round fuses, disconnect the battery, then wire brush each fuse and holder every 5 yrs...or whatever your climate dictates.
Whenever you disconnect a connector, inspect, clean, repair as needed. Much less time and hassle than "it looks OK".
Think of it as the electrical equivalent of changing your oil every X,000 miles.