Create Beamer slides with presenter notes.

1. Add the following lines in Latex header:

\usepackage{pgfpages}
\setbeamertemplate{note page}[compress]  %% plain or default
\setbeameroption{show notes on second screen=left} % right = Content, left = notes

The option "left" will create a note page while the option "right"
will create a presentation slides.

2. In the beamer source, use \note{ xxxx your content} in each frame.
Only itemize environment can be used.

3. Create two pdf files, one is the presentation slides and another is
the presenter note file.

4. Open both files using Skim. In the presentation file, go to View ->
Presentation Options --> Synchronized Notes Document, and select the
presenter note pdf file.

5. Drag the presentation window to the projector screen and keep the
presenter note window in the laptop screen.

6. Start the presentation. The presenter note page will follow the
presentation page.