A number of times I visit someone’s home to educate or fix a computer, I find a mess of cord beneath the desk. This is a smart idea to keep cords organized so you know what goes to what. I also put stickers on the plug end, telling me which electronic its connected to.
Although sandwich bag plastic thingies are a great idea, you can also use masking tape or any number of labels to do the same thing.
I will use wire sandwich ties to bind up cords out of the way so they’re not all tangled. Seriously, this helps keep the place looking neat and ordered.