We recommend that first-time Pi users start by downloading and installing our New Out of Box Software (NOOBS) onto an 8GB (or larger) SD card.
To free up SD card space, the offline NOOBS package now only contains the Raspbian archive. To install Arch, Pidora, LibreELEC, RaspBMC or RISC OS, you will require a network connection. Once you have installed an operating system, you can return to the NOOBS interface by holding down Shift during boot. This allows you to switch to a different operating system, or overwrite a corrupted card with a fresh install of the current one.