Our guide on Preparing an SD Card for your Raspberry Pi, has been updated to include how to use Raspberry Pi Imager to install an OS to an SD card.
Once you have your Pi and SD card, the next step is to install an operating system onto the SD card. Previously this was a bit difficult, especially for beginners, because of varying main operating systems (macOS, Windows, Ubuntu, etc.) and their different methods of accessing the SD card.
It’s as simple as choosing the desired operating system, selecting the SD card, and hitting WRITE.