From Fedora Project Wiki
- On the Configure storage screen, delete all existing partitions (if any).
- Create any necessary bootloader partitions (e.g. EFI System Partition for UEFI installs, BIOS Boot partition for BIOS installs onto a GPT disk, PReP boot partition for PowerPC installs) The screen should indicate what partitions are required and/or recommended on the right-hand side. If testing a specific filesystem (e.g. ext4, btrfs or xfs), create the /boot partition as this filesystem if the installer allows you to do so; if not, create it as ext4.