So if you're installing an operating system, gone are the days when you can fit an OS on a floppy disk or a CD. More than likely it's best to move to a USB flash drive. Normally, copying the ISO image file to a USB drive won't be recognized if you try to boot into it. The files have to be prepared in a way that the computer will recognize the image.
One program we've used if it's just one ISO you need is called Rufus. Rufus will run a process that will unpack the ISO in a way that the computer can boot into it (as far as I know).
Ventoy is different in that once the USB drive is set up properly, you can then copy ISO images into it, and it's ready to go. If you need to update one of the images, you just delete the old one and copy in a new one. Every time you boot into your USB stick, it will find all the ISO's stored there and you have access to boot into any of them.
Original reference can be found here: https://www.ventoy.net/en/doc_start.html
For a Windows install of Ventoy, it looks fairly straight forward (let us know if you have trouble though and we can check it out). Below are the steps through Command Line in the terminal.