Types of PCIe Slots PCle Lanes

You can almost see the writing on the motherboard that says PCIe x4, and then you have the PCIe x16 for the 16-lane slot on the right And selling a PCI Express

I would like to see how many PCI slots I have in a server and how many of them are in use Is this possible with just some Linux commands

what is agp slot It's a slot of x16 size but electrically x4 This

what is ll slot book PCIe adapters that you could use in your PCWorkstation 2) Find a method for using PCIe