These are Ethernet cables.
These are Ethernet cables.
These are likely power cables. Are they linked to the power supply unit?
You don’t have to disconnect them if you’re purchasing a new PSU.
Are you sure you understand which input the front panel connects to?
For your watercooling pump, it doesn't need to be disconnected. Just search YouTube for 50 PC build tutorials.
Yes, you've got it right. You're replacing the old power cables with the new ones for the CPU, GPU, SSDs, and the 24-pin connector on the motherboard.