Which slot should I use for my SSD?

From what I can tell this would suit my needs

2 slots were common, it's not like SATA was super common and then NVMe came later, they came together and always coexisted some cheaper

m2 expansion slot Comments92 · Can You Use ALL Slots On Your Motherboard ??? · How to Install

m2 pcie 40 in 30 slot The Gigabyte motherboard has 3 slots available, marked M2A_CPU, M2B_SB and M2C_SB I guess M2A_CPU has direct lanes to the CPU, the others are