The user must imagine the cable as really is; a delicate metal covered by insulation. Every time you move the cable, the metal conductor receives a quantity of stress and for this reason the best policy for a cable is leaving it without movement. When it's not possible, metals break more easily with bending of higher angles and this means to not force the cable in those extremes.
Another common mistake that numerous individuals experience appears in the incorrect handling of the connector. Most cables fail in the joint conductor-connector because it's still a more delicate area than the conductor alone if the connector doesn't provide a method to fix the insulation to the structure. Jacks for instance have a metal pin in which the cable could be clamped thanks to pressure. However multiple times the manufacturing process (that usually requires soldering and cable stripping by hand) doesn't do it correctly so the cable receives all the force in the solder joints. A recipe for disaster but if the user handles the connector with care perhaps it could last a lifetime. If the user pulls from the cable and not from the connector, soon it will fail.
When a cable fails, of course there are four failure options (connector A – insulator - conductor – connector B) thus it's not necessary at all to discard the other that are in working conditions. With a multimeter with conductivity tester any person could check what part fails and restore the functionality normally utilizing a soldering iron and maybe even clamping the insulator to the connector better than before.