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Topic: No idea how to boot..

So I got gparted iso on a usb flash drive. I put it in my laptop and up pops a flashing _ symbol. Nothing else happens.

I have Ubunto 20.04 or whatever the version is and want to resize the partition so I can also install Windows.

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Re: No idea how to boot..

Please be sure you have prepared a bootable usb stick, not just a usb stick containing the GParted iso file.
You can find info about making a bootable GParted usb  >>  here.
Furthermore, you have eventually to adjust BIOS / UEFI settings in order to be able to boot from usb.

*** It is highly recommended to backup any important files before doing resize/move operations. ***