Which PowerPoint shortcuts should I use when presenting and how to rehearse?

Although, I am no expert presenter, I want to share the experience I have and especially that when about to give a presentation to an audience, being on zoom or in a room, it would be better to know

1) how long it will take

2) preview the presentation tools such as presenter mode before connecting an external projector or screen, right?

In this video I will show you how to do just that, even though you may only have one screen on your laptop, you can still see what it will look like using 2 displays.