Good program to write notes on PDF files?

[vmflapem]

I'm a university student, and I've seen some people who wrote notes and even drew simple pictures on PDF files using their MacBook.
I was wondering what kinds of programs are good for such purposes.
It would be even better if that program allows me to add some slides in between.

 

[GGJstudios]

I'm a university student, and I've seen some people who wrote notes and even drew simple pictures on PDF files using their MacBook.
I was wondering what kinds of programs are good for such purposes.
It would be even better if that program allows me to add some slides in between.

You can use the Preview app which comes with OS X to annotate PDFs, combine them, remove or add pages, etc.

 

[ckeck]

You can use the Preview app which comes with OS X to annotate PDFs, combine them, remove or add pages, etc.

IF Preview doesn't do the trick, then I'd recommend PDFPen.