 Installing an operating system on your Raspberry Pi is easier than ever. Download and install Raspberry Pi imager to a computer with an SD card reader. Then open the imager. Insert an SD card you want to install to. Choose the operating system to install, most likely Raspberry Pi OS. Optionally, you can pre-configure the OS at this point by pressing CTRL, SHIFT, X. Then choose your SD card, write, verify, and your system is ready to operate.