Minecraft wiki entry for Time-saving_tips, associated text: One of the best ways to mark a path through a cave you are exploring is agreed on an in-out, left-right rule. Place your torches on the wall on the left side when you go in, and to find the way out, turn around, and the torches you placed on the left-hand wall, will now be on the right hand, and you can use the classic "right-hand rule" to navigate your way out. It's useful also for forking tunnels when you don't know which fork you had already taken.