glacial

So i have preordered the new Z590 Rog Maximus 13 Extreme Glacial and I'm looking at its 5 M.2 ports. Now for context, I'm upgrading from Z97 so I predate m.2s. I know some use the CPU PCI lanes and some use the PCH/Chipset. Now I've looked at the digital manual and can't understand it, Please...