How to connect a SATA III HDD to an SSD PCIe NVMe x4 slot

XPS 8950, using SATA 3 port for SSDHDD four drives sata 3 slot SATA Port Expansion card PCIE 3 ASM1064 review EXPLAINED: PCIe lane SWITCHING sata slot Im going to buy a SSD and I wanted to know where should I connect the SATA3 6gbs in my motherboard SATA slots?

sata m2 slot SATA SSDs Does PCIe Gen 4 make PCIe NVMe SSDs faster? PCIe Gen 3 was unable to accommodate the full bandwidth of high-speed PCIe NVMe SSDs This was