Here is a simple tip to help you keep your guitar in tune. Note: This tip is for guitars with a standard bone, plastic,nuts etc. Not a locking nut system like a floyd rose. If you are having problems with your guitar staying in tune try stretching the strings a couple of times then re tune. Try this a couple of times and see if this does the trick. If not get a pencil then lift the strings one at a time away from the nut and rub the pencil point in the grooves where the strings go.