If your Mac suddenly refuses to boot up properly, you might need a bootable macOS USB installer to make repairs. Building a macOS Mojave bootable install drive is relatively simple, here are the steps. Remember that creating a bootable MacOS Mojave USB installer drive will erase all data on the destination USB flash drive or volume, this is necessary in order for it to become the bootable installer disk. How to Make a MacOS Mojave Installer USB Boot Drive.
In fact, all the methods and tools out there to create Windows 7 bootable USB work great with Windows 10 as well. Preparing a bootable USB of Windows 10 is as simple as making a bootable USB of Windows 8 or Windows 7. How To Make Mojave Bootable Usb On Windows 7.