Sticky Camera Versatility
The sticky camera isn't just for scouting. Fire it at a wall near a group of enemies, then activate the gas to incapacitate them all silently. Alternatively, use its noise function to draw a single guard into a dark corner for an easy takedown. It can also be used to peek around corners without exposing Sam.
EMP Grenade Timing
EMP grenades are powerful but have a limited duration. Time their deployment precisely to disable cameras and lights just as you're about to pass through. They can also temporarily disable automated turrets, giving you a window to destroy them or slip past. In a pinch, they can even stun enemies.
Diversion Tactics
Combine gadgets for complex diversions. For example, throw a bottle to draw a guard, then as he investigates, use a sticky shocker on another guard who might be watching. Or, use a diversion camera to lure a guard, then quickly move past his original position while he's distracted.