Don't confuse the three. You may need notes: for your eyes only. They may need visuals or similar to give them clarity. And they may need summary/'take-aways'. Many presenters compromise and use PowerPoint to do all three in one. It does, but badly. Each requires their own format and own approach.
Bonus 1: more pres tips
Bonus 2: Love Presenting Hate (badly used) PowerPoint, the book