Watch Easy way to create a linux live usb using etcher video on DTube
Since i'm quite a avid distribution hopper, i often use a tool called etcher, which is a electron based flashing tool.
I often use torrents to download ISOs because i feel its slightly faster than downloading through a browser when set to high priority.
To boot into the newly created Linux live usb, all you simply need to do is power off the computer, and then turn it back on and start pressing the F12 key. (Works on most computers... Some have other key combinations to access the bios, or the bios is locked.).