A is for activating stuff.
B is for batch crafting and butchering.
C is for closing doors and windows, so you have more time to prepare for zombies.
D is for dropping stuff, so you don't overload yourself.
E is for eating, so you stay full and examining, so you can disarm that explosive.
F is for firing, so you won't hurt yourself when fighting a zombie.
G is for grabbing vehicles, so you can pull that cart and for picking items from the tile you're standing on.
H is for happiness, so you can craft.
I is for inventory, so you can manage it.
J is for jackhammers, so you can drill in concrete walls and other things.
K is for keyboard, which I hope that it doesn't break in the worst moment.
L is for lamps, so you can see and craft.
M is for materials, which you should gather.
N is for night, so you can be sneaky.
O is for removing parts from vehicles, so you can build your death-mobile.
P is for pills, which you should gather.
Q is for quenching your thirst, which should be done regularly.
R is for reloading, so you can fire your weapon.
S is for smashing, so you can break stuff and prevent zombie revival and for saving, so you don't have to restart.
T is for trees, which you should chop down to obtain wood.
U is for unloading, so you can dispose of unnecessary liquids.
V is for viewing, so you can look for useful items.
W is for wielding, so you can fire your weapon.
X is for looking from a corner, so you won't be surprised by turrets.
Y is for confirming Y/N/(I) prompts, so you can react to monsters.
Z is for zombies, which can kill you.