There is two triggers on XBOX and Playstation controlers but no one on a keybord.
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The left trigger and right trigger are the buttons at the top of the controller that you pull with you fingers
It is the button on the top left, sometimes called the bumper, it above the left trigger
Left mouse button.
For the PC, right click to place a block. For the Xbox 360, you hit left trigger on the controller. For the iPod Touch and the iPhone, you tap the screen when facing a block.
A button named LT(Left Trigger) does not actually exist on a PS3 controller. The closest thing to LT is L2. It is the second button down on the left back side of the controller.