A good summarize

I would write about how to make a good summarize because it's a very important thing.
When I went to school, teachers thought us to study making a brief map of the lesson, but a lot of child couldn't do it. I think it's difficult to make a good summarize.
First of all, you have to read the lesson, article, review... a pair of things and mark all words and sentences you don't understand for have a global vision. Later you look for all you don't understand and you write main ideas in a sheet of paper.
Secondly, you write an abstract to organize your ideas.
Finally, you revise it and change words with synonymous and antonymous.

The goal is understand and learn the most important things.