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Above is a 15 minute video explaining all about how you can create and maintain AutoCAD short cut commands by editing the acad.pgp file in two different ways.
Creating command shortcuts goes back to using AutoCAD from the very beginning. It let's you access commands very quickly by typing in one or two characters and then hit 'enter'.
L for Line
M for Move or MM for Move
C for Copy
CI for Circle
CI for Circle
MI for Mirror
E for Erase
X for Extend
EX for Explode
T for Trim
D for Dist
R for Rotate
etc..etc.....what ever you want...
You can use the old fashion method (my favorite) by editing the acad.pgp file directly with 'notepad' or you can use the Express Tools Command Alias Editor.
Either way once you get your short cut commands in order you won't be able to live without them.