Question

What types of information should you include in your notes? What should you exclude?

Answer 1

You must include in your notes everything that is relevant to what is the purpose of your note and everything that helps that goal to be achieved. For example, if you are doing scientific research notes, you should put information such as dates of events related to your annotation, authors with works related to your research, and other information.

On the other hand, you should exclude superfluous, unnecessary information that distracts or is about different subjects.

Answer 2

You should add it all, just in fragments. For example (this is not relevant in any way, but:) 

red capes, keep sun off skin. 

Just keep it short and sweet, as long as you understand it who cares.