Waveshare Accessory Compatible with Raspberry Pi 4 ...
Ever since people figured out that the Raspberry Pi 4 has a PCIe bus, the race was on to be the first to connect a regular PCIe expansion card to a Raspberry Pi 4 SBC.
Getting started - Raspberry Pi Documentation
All Raspberry Pi consumer models since the Raspberry Pi 1 Model A+ feature a microSD slot. Your Raspberry Pi automatically boots from the microSD slot when the slot contains a card.
