Just download Balena Etcher (it's the easiest USB flashing tool), flash a Linux Mint .iso file to a flash drive using it and boot from it like you do with Windows installers. Unlike Windows, Linux can work in "demo mode" straight from the USB without installing to the hard drive. It may be slow in this mode but it should give you an idea of how Linux looks and feels. If you like it, double click the "Install Linux Mint" button in the top left corner and proceed with installation. Other distros usually have the installation icon on the same place or somewhere in the "Start menu" so you shouldn't have hard times finding it in case you decide to try another distro