What is is called when you make overall changes to your document in revision?

Comprehensive.

Explanation:

In any case of trying to improve written documents, be it of academic articles, the need to revise and review the work is a must. These two steps allow for mistakes to be detected and corrected before they are given over for evaluation.

And when there is an overall change in the document after revision, it is known as a comprehensive revision. This means that there is a complete change in the document. Thus, the correct word is "comprehensive".

when i skim a text i look for anything i'm trying to find, like keys or clues or i just want to see if it is interesting to me.

explanation:

thinking about things and referring to books instead of acting on superstition and gossip.