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A set of 3 points will always be coplanar, but will only sometimes be collinear. Collinear points are always coplanar as well.
No
No. In order to be coplanar, points have to be in the line.
No. A trinagle does not require four points, three are sufficient. And any three points, if they are not colinear, must be coplanar.
Yes. Three co-linear points define a line, and therefore also lie on a plane, but those three points do not necessarily define only one plane. You need three points, not co-linear, to uniquely define a plane. See Related Links below for more information.