Usually when there's 2 dots(data points), you can place a line.
When there's more data points, there's way to calculate "best line" that reduces error to the minimum. So kind line best choice of approximate line that defines these dots.
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The line of best fit does not have to pass through the 0 (origin) and rarely does
The line of best fit is simply the line that shows the general direction of the graph. The trick is to make the line go through as many points on the graph as possible. Some scatter plots have no line of best fit.
Not necessarily. Often it is, but the line of best fit is simply an equation that closely matches the results. Therefore any line could be a line of best fit, linear, quadradic, or even cubic! The sky (and the results) are the limit.
Data points that are not close to the line of best fit are called outliers.
The best fit line is basically the average of a graph; it represents where, when, etc. the majority of the event occurred.