Common sense? You're kidding me right?
Computers are the most illogical creations on this planet, common sense has no place in learning about computers.
The people designing and creating these machines have no common sense and no perspective on how the average person thinks - even though they think they do.
Being computer illiterate does not mean you are dumb.
What if you couldn't draw or paint and a group of artists called you a moron because you couldn't manage a simple picture, and they said "use your common sense" ?
Wouldn't go down to well I imagine.
You must have tolerance, people are skilled in many different things, and computers - despite how common they are - remain a mystery to most people because they are just over complicated and time consuming, and quite frankly not needed in life.