What are "grid hotkeys"?
Basically, it makes it so all devices in a structure, device regulates, etc are appointed hotkeys based upon their placement in the UI. As an example, given that a Marine is the Top - Left in the Barracks, its hotkey would certainly be Q. Below is a web page I located that has a tiny image to highlight : Grid Hotkeys.
Grid keys change the default keybinds by in fact mapping the squares of the device cards to particular switches on your key-board.
I do not recognize the specific commands off hand, yet it functions something similar to this:
QWERT ASDFG ZXCVB
These keys come to be the 3x5 grid of the device card. Pushing "T" causes the leading rightmost command, generally strike action, despite the device, and also as opposed to the common "A" in the default keybindings.
Grid Hotkeys are a hold over from Starcraft 1.
Default Hotkeys make use of letters in the building/action command for which reference. As an example, to construct a B u nker you can make use of the U key.
Grid is a different design that resembles the format design of commands on the key-board. As an example the S leading command is generally bound to the S ; grid rather binds it to the W key.