Basic commands

 
WASD keys

the wasd keys will move you forward, backward right and left.

w = forward
a = left
s = backwards
d = right
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​You can run by double tapping the w key if you have enough stamina.
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The space bar makes you jump.
Holding down the left mouse button will destroy any object the cursor is pointing to. This can take time.
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Holding down the right mouse button while holding an item will either make you eat the item, use it or place it. For example eating an apple, using a potion or placing a block.
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When in creative mode, clicking an object with the scroll button of the mouse will copy it into your item bar.

Pressing the E key will open up your inventory.