#7 is a little tough for me to articulate but here is the basic idea: Most target zones are elongated. When you're trying to get shape by moving into a target zone, you're typically trying to get on the same line as the line between your next object ball and it's intended pocket. Once you get on that line, it's easier to stay on it with the cue ball moving more parallel to it as opposed to crossing it perpendicularly. If the cue is rolling more or less parallel to that line, you may have a margin of error of half the length of the table or more. If you're moving across the zone, you may only have a margin of error of a few inches before you get out of line.Assuming you’re talking about 8-ball, #7 and #3 are both misleading that they actually hurt more than they help, IMO. They need better wording.
I would add one of my “Runout for Dummies” guidelines:
Stay away from using the side pocket as yout keyball pocket. It works nicely for 14.1 when you’re clearing the table and you’re looking for “the triangle,” but if you’re running 8-ball with the other guys balls in the table, side pocket key balls are doom.
Freddie
As for #3, the idea is to clear out one portion of the table first and then move to the next so as to minimize cue ball movement. Some others have put it better than me.