What to teach my son?

I see all these posts about teaching babies to wave, point, point to body parts, etc. I have no idea what I should be teaching my son, when to teach it and how to teach it. Like how do you actually teach him to point at things? By just doing it myself? Do I grab his hand and point with it?

How do you know what to work on and how to work on it?

What is everyone currently working on?