Yes, if you are talking about Euclidean geometry.
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3 points must always be contained in one plane, as 2 make a line, it makes no difference as to where the third point is, it will exist in the same plane in the two. Aside from all three points being in a line, this is always true.
Yes. You require three non-collinear points to uniquely define a plane!
Yes a plane can always be drawn three any three points, whether they are linear or not.
No. The tiniest piece of a plane contains an infinite number of points. But if you give us just three points, then we know exactly what plane you're talking about, and it can't be any other plane.
Collinear points