In order to create a bootable USB to install macOS, you would need access to a Mac computer. There are tools available that help during the process, but it's highly unlikely that things will be ...

Using Disk Jockey, you can create disk images for a variety of retro computers. You can also inspect the contents of existing disk image files for foreign file systems on your Mac or Windows computer.

ChromeOS Flex can breathe new life into your old computer. ChromeOS is fairly easy to install and should work on most computers.

Google's Chrome OS Flex program lets you transform your existing Windows or Mac machine into a Chromebook.