I will give an example of creating a bootable flash drive with Kali Linux.
Kali Linux is a security testing tool.
1) First of all, download the ISO image of Kali Linux from the official site www.kali.org
2) Download “Universal USB Installer”
pendrivelinux.com/universal-usb-installer-easy-as-1-2-3/
files.ixnfo.com/Soft/Universal-USB-Installer-2.0.1.4.zip
3) Connect the USB flash drive to the computer and run the Universal USB Installer.
In it we agree with the license agreement by clicking “I Agree”, in the second window where “Step 1:” select “Kali Linux”, where “Step 2:” click “Browse” and point to the downloaded ISO image. In “Step 3:” choose the letter of the flash drive, tick the “Format” (this will redistribute the file system table and erase all data on the flash drive).
“Step 4:” you can not touch if you later only want to install the system from a flash drive. If you change (this will slightly prolong the process of creating a bootable USB flash drive), you can use the specified location on the USB flash drive as needed to save user data, for example, if you boot from a USB flash drive and start the system instead of installation, all settings you have made will be saved in the system (for example, browser bookmarks, installed components).
4) Click “Create” and wait for the completion of the process.