In business (specially in retail) the 3 most important words are: Location, location and location.
In public speech or training, the 3 most important words are: preparation, preparation and preparation.
I am so poor with memorization. This is why I do not memorize, I internalize.
Mastery of the subject matter is key.
Question: How long does it take you to prepare for your presentation?
Can you still present should there be a power failure and your PowerPoint does not work?
How would you handle the situation?