what debian compatible live usb software do you use to test distros or gparted and install them?

OK, does Ventoy now include tools of some sort and not just a way to boot ISOs? Because as far as I know, it just boots LiveUSB images you place on it. If one of those happens to have partitioning tools, you're using the tools included in that distro.

Multi writer, KDE writer, Rufus, Mint stick. Take your pick depending on distro.

??

# cp /path/distro.iso /dev/stick you mean that?

You use ventoy to boot into a live linux iso and then run gparted to resize, though there is a chance you have to do a non persisting install of gparted first.

glim is like Ventoy, but built on GRUB with much cleaner code and no blobs. Doesn't work with as many ISOs though.

Any way you boot it, gparted should work just fine from a live ISO.

If you're just testing things out, Ventoy should be fine. If you want full assurance nothing fishy is going on when installing, do it the old way and dd the image to the USB.

can I use gparted on ventoy to resize partitions on a notbook?

Yes, you can use the gparted ISO on ventoy or any other live ISO that has gparted to resize partitions.

You would be better served by asking questions in the existing post, instead of starting multiple new ones. Besides, these questions were already answered.