What’s the meaning of a good rule of thumb? I don’t understand the properly meaning. Thanks
“A rule of thumb is a principle with broad application that is not intended to be strictly accurate or reliable for every situation. It is an easily learned and easily applied procedure for approximately calculating or recalling some value, or for making some determination. It is based not on theory but on practical experience.”
“a way of calculating something, which is not exact but which will help you to be correct enough”