One trick I learned from a graphics editor: if you have two Bezier segments and want to make a smooth transition between them, put the two control points on eit

One trick I learned from a graphics editor: if you have two Bezier segments and want to make a smooth transition between them, put the two control points on either side of the center equidistant from the center and on a straight line. The curve will be tangent to that straight line at the center point, and will have the same curvature where they meet.