Which Slot to use?

Which Slot to use? m 2 2280 slot 228022110 NVMe SSD slot x1 228022110 NVMe SSD slot x1 Memory expansion 1* PCIe x16 slot (Half-height, single m2 slot screw 2 form factor, which is a small, rectangular shape that connects directly to the motherboard of a computer using an slot The interface

m2 slot screw 2 socket 3, Key M , which is the most common of all Is there a third slot, which is occupied by the original SSD? We want to install

m2 slot pc 2 SATA SSDs that usually have the B and M cut-outs and the slot normally has only the M key on the right side A NVME SSD will slot in 2 M key slot is compatible with both B+M key SSD and M key SSD ” So again the question is does that M key slot also have to support Sata??? What