W/A/S/D: move
Space: jump
Left mouse button: Punch, mine blocks, move an item stack in an inventory
Right mouse button: use (e.g. open chest or furnace), place blocks, move one item or split items in an inventory
Shift + Right mouse button: place blocks
Middle mouse button: move 10 items in an inventory
Mouse wheel: select item in the hotbar
0-9: select item in the hotbar
Q: drop block, item or tool in hand
I: open or close the inventory menu
T: open the chat window
Shift: descend on ladders or sneak (walk slower, prevents falling off ledges)
T – Opens the chat window.
/ – Opens a chat window where the “/” has already been typed for you so you can then type a server command right away.
F5 – Enable/disable debug screen which also shows your coordinates. (Useful for using /teleport command.)
F10 – Open/close console/chat log. Shows previously issued commands and chat log and also will accept a new command or chat message. (Use Page Up and Page Down keys to scroll.)
Shift+Left mouse button – Automatically transfer item stack. (See Auto Transfer for full explanation.)