The controls in CnC3 are quite simple, but they have changed a 
little bit since past CnC games.  The main things that have changed are
the ability to formation preview and you must now right click to give 
units commands.  I suppose this was done to help micromanagement and 
most other RTS games use this system of right clicking.  At first this 
confused me, but I got used to it and found this to be a very effective 
control scheme.

Note: These are the default controls. You may change them by going to
settings in the game menu.

Left Click: This controls basically everything in the game that
requires a click of the mouse button.  Anything from selecting units,
deploying structures, or building units require you to use this button.
Right Click: This is used to give commands such as moving to your units
and also to cancel and hold units and structures in the build tab.
Mouse Wheel Up/Down:	 Zooms the in game camera in and out.
A + Right Click: Attack move. Tells any units you have selected to move
to the desired location attacking hostile base defenses and units along
the way. They will not attack enemy buildings.
S: Stop units.  Immediately stops the selected units.
D + Right Click: Reverse move.  Forces the units to move to the desired
location backwards.  This is used to prevent enemies from hitting your
vehicles unarmored side and to speed up retreat.
F + Right Click: Assault move.  This tells the selected units to move
to the desired location while attacking any hostile buildings or units
along the way.  This is useful to clear out entire bases without having
to tell them what to attack.
G + Right Click: Force move.  This forces your units to move to the
location even if units happen to be in the way.  This is used to crush
enemy units if possible.
H: Primary construction yard camera. This is used to jump to your
construction yard with the press of a button.  If destroyed, it will
jump other construction yards then to cranes.
Ctrl + J, K, L, or ; Sets a camera bookmark. By pressing both Crtl and
one of the following buttons you may set a camera bookmark.
J, K, L, or ; Jump to camera bookmark.  These jump to the set camera
bookmark. Useful to jump back and fourth from key spots in the game
easily.
' : Toggles unit health bars
~: Selected structure or unit tab (known as contextual tab).
Q: Selects all combat units.  This is used to select everything you
have.  Useful to throw everything you have at the enemy at once and to
see how many units you have.  Double tapping Q selects everything on
the map.
W: Selects all units of the type currently selected. This is used to
get all the units of a specific type or types together for an assault.
Double tapping W selects all the units of the types currently selected
across the entire map.
E: Structure tab.
R: Defense tab.
T: Infantry tab.
Y: Vehicles tab.
U: Aircraft tab.
I: Intel database (single player)/Messenger (multiplayer)
O: Objectives (single player)/Player status (multiplayer)
Z: Sell mode
Ctrl + Z: Planning mode:  This mode allows you to make multiple
commands to a unit.  Press it again to have the unit complete the
commands in order.
X: Power mode.  This turns off and on power to a structure.  Useful to
direct power to vital structures.
C: Repair mode.
V: Voice chat.  Press this key to talk with a microphone.
Ctrl + V: Toggle either global voice chat or team voice chat.
B: Place beacon
N: Next harvester. Used to jump between harvesters.
>: Fast forward button (only during replays)
0-9: Selects grouped units. Simply press the number to select your
entire group without worrying about manually selecting all of them. It
is very useful to group assault forces to control them much easier.
Ctrl + 0-9:	Sets the selected units to a number.
Backspace: Opens up chat to all teammates.
Enter: Opens up chat to everyone.
Alt + A: Changes stance to aggressive.
Alt + S: Changes stance to guard.
Alt + D: Changes stance to hold ground.
Alt + F: Changes stance to hold fire.
Ctrl + A: Uses unit power in slot one.
Ctrl + S: Uses unit power in slot two.
Ctrl + D: Uses unit power in slot three.
Ctrl + F: Uses unit power in slot four.
F1-F10: Selects the unit or building in slot 1-10 respectively.
Ctrl + F1-F8: Uses support powers in slots 1-8 respectively.
Delete: Deletes the beacon.
Keypad 5: Reset camera.  Keypad 5 is on the right side of the keyboard.
Hold Alt: Waypoint mode.  This allows you to select multiple commands
for the selected unit(s). They will start the commands upon receiving
the first one.
Hold Ctrl + Right Click: Force fire.  This forces you unit to fire at
the location no matter what.
Hold Shift + Left Click: Adds unit/structure to selection.
End: Toggle HUD.
Tab: Next sub tab.
Ctrl + Tab: Previous sub tab.