ASUS 600-series motherboard PCIe Q-Release

What is PCI Express? Do PCIe lanes, slots, and versions matter? where is the pcie slot On the B550M they are aligned perfectly whereas on the B450M the primary slot is underneath the left middle screw So If you're buying an mATX where to play bonanza slot Using lspci -vvv I can get the PCIE slot numbers of these 4 cards But how to match the PCIE slot number with the device name? For example one

wheres the gold slot machine Motherboard manufacturers have a limited amount of PCIe lanes available to them based on the chipset and CPU being used They determine how many PCIe slots and