Wire stripping and crimping. Especially if you plan to do offgriding homesteading with solar but occasionally comes up in home applications when you want to revive a mangled extension cord or install a fixture. Specialized cables start to add up very quickly its much more cost effective to buy a big bag of connectors, a big roll of decent gauge wire, dig out an old set of wire cutters+needlenose and fire up a 2 minute instructions yt video. Like all other skills it takes time and error to get good at it but its not too terribly difficult as wel as very cool to essentially build your own electrical grid from the ground up with wires and connectors you made yourself…