Like, uhhh, see what I'm sayin'?
That umming and ahhhing sometimes bothers me when I'm watching an informational video (YouTube or other). OK, they're knowledgeable and informative, and not professional speakers, but a run-through from a written script before the camera is turned on would be very helpful.
I've had a number of occasions where I had to teach or lecture (no, I'm not a professional teacher) on various subjects and I always prepared with a written guide to hold or have on the lectern or table while speaking. Not that I read from it directly, but it was right there as a guide.
Another thing I found* was that if you're going to use a numerical example, work out the problem in advance
no matter how simple or trivial it is. In these cases, I would start with something like "Let's pick a number, ohh, just plucking one from the air, say, 132," and write it on the board.
But you can bet the number wasn't just "plucked from the air." The problem had been thoroughly worked out in advance.
And sometimes to keep the class attention, I'd say something like, "OK, so that works out to 147 times 34... anyone got a calculator?" and write down the class's answer**.... knowing it in advance anyhow, of course.
I've seen a couple of tutorial videos where the speaker screwed up, and had to put overlays on the screen for corrections. Deucedly annoying.
Terry, 230RN
* Through trial and
very embarrassing error.

** 4,989