It is important to remember command structures. But more importantly, teach your hand, thumb,fingers and wrist the command structures. Muscle memory plays an important role in Autocad efficiency.
Click on the object
Window crossing(create a box)
Telepathy
A and B
Using a window crossing from left to right
Using a window crossing from right to left
Using a window crossing from left to right
Using a window crossing from right to left
Extending lines to an invisible boundary of another object's directional path
Extending a line directly to another object
Wait!
Here's an interesting quiz for you.