In louise's speech about various golf grips and strokes, louise used several golf clubs and demonstrated the moves herself. according to your textbook's guidelines on the use of presentation aids, was this a good technique?

Yes, because a speaker can serve as a presentation aid to demonstrate how something works or is done.

In every speaking event, the audiences' attention would automatically directed to the main speaker in front of them.

So, they would also automatically observe every actions that initiated by the main speakers (such as making demonstrations or showing some sort of slides)