What Is an Slot and What Devices Use the Slot?

Will a M+B key 8x Sata card work in a M key socket? m2 sata slot 2 connector slot An SSD can be used with both SATA and PCIe protocols SATA is a standard for connecting and transferring data from HDDs to computer m24 slot Yet there are 5 SATA ports in the bios…and the M2 stick is showing up in that 5th port That much makes sense to me The 'problem' is

m2 sata slot NVMe: 1 Slot; SATA SSD: 1 Slot; Micro TF: Supports 32GB, 64GB, 128GB