Quick answers
How do I see coordinates in Minecraft?
Press F3 on Java Edition for the debug screen; XYZ shows your position. On Bedrock, turn on Show Coordinates in World Settings and they appear in the top-left corner.
How do I sprint in Minecraft?
Hold Left Ctrl while moving forward, or double-tap W. On controller press the left stick while moving. Sprinting drains hunger faster.
What does pick block do?
Middle mouse copies the block you are looking at into your hand if you have it in your inventory; in Creative it gives you any block, including ones with data.
How do I drop a full stack?
Hold Ctrl and press Q with the stack selected, or drag it out of the inventory window. Plain Q drops one item.
How do I switch to third person?
F5 cycles first person, third person behind and third person front. On controller press D-pad Up.