Amazon The Raspberry Pi 4 board sports a quad-core 1.5GHz Cortex-A72 processor; 2GB, 4GB, or 8GB LPDDR4 RAM; dual-band Wi-Fi; Bluetooth 5.0; and gigabit ethernet, 2x micro-HDMI, 2x USB 3.0, 2x USB ...

Boot your Raspberry Pi and you will be presented with a menu offering many different operating systems for installation. Tick the box next to Raspbian and then click Install and wait.