Good tips and tutorials for cable management?

I made the mistake of buying a prebuilt PC, thinking it would arrive perfect, just like in the photos, with few visible cables.

Result

Big mistake

I think there are a lot of cables that can be hidden. Among them are the graphics card cable, the case buttons, and the power supply.

But how can I improve this? Could someone give me tips on how to do it, preferably some video?

I also saw that there are kits to change the position of the graphics card. Will that help hide its cables?