ABC three points are in the same plane but not on the same straight line. You can draw three straight lines through these three points, right?

ABC three points are in the same plane but not on the same straight line. You can draw three straight lines through these three points, right?

yes.
In general, if there are n points in the plane and any three points are not collinear, then every two points can make a straight line and n (n-1) / 2 straight lines can be made