The difference between PCIe x1, x4, x8, x16 and x32

My first motherboard runs the 3x full size slots in a PCIE 4x configuration, with the single slot at 1x configuration How can I change

Slot 2, PCI Express x16 ; Slot 3, Slot not available on this board ; Slot 4, Slot not available on this board ; Slot 5, PCI Express x8 in a

4x pcie slot PCIe UD Slot X：PCIe x16 slot with 10X strength for graphics card; EZ-Latch Click： heatsinks with screwless design; EZ-Latch Plus： slots with

4x4bet slot 4x PCIe card Close inspection reveal the head of the PCIe connector match the PCIe specification in term of voltage I supposed they used