Personally, I use Flameshot. It works just fine. However I hate that the taskbar overlays on it and makes clicking some buttons impossible. On windows, I used to use ShareX. Which is quite similar to Flameshot...except that it had an uglier UI.
I use the default (gnome-screenshot on core, xfce4-screenshooter on Lite) as they allow a delay in snapping the shot if desired and can capture the pointer, etc.
Ditto.
For screenshot I use default screenshot tool. (Ctrl + printscrn more options on settings (keyboard shortcuts))
Kazam. This one has both screenshot and screen recording. Keyboard shortcuts are also mapped for starting ending and pausing a recrding.
For screen recording I've found the most reliable to be vokoscreenNG when it comes to recording games in full screen and with enough options to get a decent fps and sound.
install from terminal or software Zorin?
Video screen recording tools like Kooha or Kazam recently stopped working for me on ZorinOS but vokoscreenNG (via flathub in software center) still works flawlessly.