It depends on what you're learning.
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No, you draw a general line through the middle of the points.(A line of fit)
To work this out get some graph paper and draw the line.
Yes, two points are always collinear. You can draw a line through any two points.
Non collinear points are not all located on the same line. You can not draw a straight line through all three of them. That's about it. ;)
Any two points are always collinear, since you can draw a straight line passing through any two points.