Should buttons be on left or right?
Are the buttons on your shirt on the left side or on the right? There's actually a pretty easy answer: if you wear women's clothing, the buttons are on the left side of the shirt. However, if you wear men's shirts, the buttons line up on the right side.
Should cancel buttons be on the left or right?
In most languages, people are accustomed to read from left side to right side, so it accords with our speech habits to put ok-key on the left side of cancel-key. 2. “Ok/cancel” type make it easier to see and select ok-key.