gnome desktop: how to split desktop into four parts (like PowerToys FancyZones)

• https://askubuntu.com/questions/1374443/how-to-split-window-in-ubuntu-20-04-into-four-parts
• https://itsfoss.com/gnome-shell-extensions/ – great source to understand how gnome-shell and its extensions work
• https://learn.microsoft.com/en-gb/windows/powertoys/fancyzones – the “prototype” on Windows

“extensions” and “tweaks” are searchable on the desktop after the suggested installations.