If the cue ball is sliding at contact, it leaves at 90° to the object ball's path, along the tangent line.
If the cue ball is rolling naturally at contact, it deflects about 30° from its original direction on a half-ball hit (the 30° rule).
Draw: hit about 1–1.5 tip widths below center, with a long, smooth follow-through.
Follow: hit above center with medium speed.