It is easy to create bootable USB drive for Windows 10 without any additional tools. Just use built-in functionality.
- Plug in your USB device
 - Run cmd.exe (Command Prompt) as administrator
 - Open the disk management utility, type in diskpart and hit enter
 - Get connected disks that are available – to do that, type in list disk and hit enter
 - Select your USB drive – to do that, type select disk # and hit enter – you’ll have to replace the # with your disk number
 - Clean the USB drive – to do that, type clean and hit enter
 - Create a bootable partition – type in create partition primary and hit enter
 - Select the partition that you just created. To do that, type in select partition 1
 - Type active and hit enter
 - Format the USB drive – type in format fs=fat32 and hit enter. It takes some time to complete formatting.
 - Assign your USB drive a letter, to do that, just type in assign
 - Copy all the Windows 10 files and paste it inside the USB drive
 
That is all you need to do.