Which slot should I use for my SSD?

What Is an Slot and What Devices Use the Slot? m 2 2280 slot I've had some troubles finding what exactly fits into this thing From the white sheets it looks like it will take a 42mm or 60mm pcie ssd m2 slot screw Or all three ports will perform the same with a standard 2280 drive?? Planning on a 2 TB Samsung NVMe 980 Pro as my boot drive Link to

m2 pcie 40 in 30 slot 2 PCIe slot which should be easy to spot in a desktop computer For laptopsnotebooks, the PCIe slot is usually under the bottom panel or under the keyboard