2-18 inches usually.
About 10-16 inches.
You should park your car less than six inches away from the curb.
Within 18 inches.
Here in California it's 18 inches.
The distance is likely to be different depending on what State you live in. Where I work, in the State of Washington, the front wheels must be within 12 inches of the curb, and if on a hill, the front wheels must be turned in.
the maxium is 6 inches but it has been debated by many if it is more
From the Calfornia DMV web page on parking: When you park alongside a curb on a level street, the front and back wheels must be parallel and within 18 inches of the curb. Park parallel to the street if there is no curb.
one foot away
Far away from what? A compass? A GPS? What are you asking for?
You just make sure not to hit the curb.
To communicate with people who live far away from you. To communicate with people who live far away from you.
Ideally you should be as close as possible to the curb when you finish parking, just to lessen the chances that your car won't accidentally get hit or scraped by cars driving too close to you on the side of the road. However, 12-18 inches is usually a safe distance away from the curb.