It's advisable to enroll your friend, partner or child in a driving school. But if you must teach anyone how to drive, we strongly suggest you teach them the traffic rules and regulations, first. Get them acquainted with road safety rules before you even let them touch the steering.
If it's someone you drive a lot, every chance you get, let them know why you are doing a particular thing. Tell them why you are keeping a safe distance from the vehicle in front and why they should keep a safe distance when they finally start to drive.
Why you are slowing down in a bend and why they mustn't speed while approaching a bend. A lot of important lessons you should teach them before telling them how to move a vehicle.
Because the rate people drive rubbish in this country is alarming. It seems no one cares about safety anymore