I don't use PowerPoint very often (usually only when I am giving lectures created by other people - I use Sumatra PDF for my own lectures), so I can never remember the keyboard shortcuts. Here are the useful ones:
F1
Shift + F5
Ctrl + T
Ctrl + Mouse Wheel Down
or g
b
type slide number and hit enter
Ctrl + p
Ctrl + i
Ctrl + l
(that is a lowercase L). Can also use Ctrl + click and hold
to temporally turn arrow into a pointer.Ctrl + e
Ctrl + a
e
Ctrl + m
Be careful when practicing a lecture and using annotations - you will be prompted to save the annotations when closing PowerPoint. You probably want to say no so that the annotations aren't included in your slides and appear during your presentation. You might want to save them at the end of the lecture if you want the students to see a version that includes the annotations.