Which slot should I use for my SSD?

The manual clearly states that the Erica6 motherboard comes with one socket 1, Key A -that is for a WiFi card and one socket 3, Key M

2 expansion card to add an additional Slot to your PC ATX motherboards have ample slots but if you have a small form factor mATX motherboard (usually

m2 sata vs nvme slot This video explains how to select which slot to use on a motherboard for the best storage

m24 slot 2_2 slot in order to maximise performance bandwidths for the graphics cards For gaming, streaming, rendering, productivity editing