Test your cables once in a while.

There is a lot of USB cables that look the same but have different capabilities, there is a lot of HDMI or DisplayPort cables that look the same but have different capabilities, there are cables that stop working once you bend them in a particular way.

There are cables that can get sticky and filthy practically on their own (Apple!).

Mind cables whose plugs are bent.

I think the same should apply to perfectly fine screws you take off broken stuff, pieces of metal profiles, nuts etc. But I could never be arsed to sort them proactively. My late father used to keep a Big Jar of Screws and spend time rummage through them when he needed a particular one. I don't know which approach is superior, to be honest.