Essential Hotkeys

Q - Drop Items
Instead of dragging items out of your inventory using your mouse, you can quickly get rid of items using Q.
To drop items in your hotbar, select the item and press Q. In your inventory, holding CTRL while pressing Q will get rid of the whole stack of items.
Left-Click - attack/destroy
Middle Mouse - Pick Block
E - Open/Close Inventory
Spacebar - Jump
Spacebar (double click) - Fly
F - Swap Items in Hands




Image Source:
https://minecraft.gamepedia.com/Controls




SOURCES:
https://www.planetminecraft.com/blog/minecraft-useful-keyboard-shortcuts-f-keys/

https://minecraft.gamepedia.com/Controls