~ = Relative to your current position.
~10 = 10 blocks away from you.
100 64 200 = Absolute world coordinates.
Pro Tip: Look at a block and press Tab in chat to auto-fill its coordinates.
Use /fill for large areas (volumes of blocks).
Use /setblock to change a single block at a location.
Pro Tip: Use /clone to replicate entire buildings instantly.
Replace: Overwrites everything in the area.
Destroy: Replaces blocks and drops them as items.
Keep: Only fills air blocks; safe for terrain.
Hollow: Creates walls and clears the inside with air.
Swap Blocks: Use /fill ... replace [old_block] to swap specific block types without touching the rest.
Precise Info: Check "Targeted Block" in F3 for exact block states like facing:north.
Undo Trick: Accidentally filled an area? Use fire replace [wrong_block] to erase them.