One of the members who has a higher reputation than me rejects my edits on the wrong basis. I know that on this site, we write Ubuntu and not ubuntu. Even when I write ubuntu, other members correct it. But one user has rejected some of my edits on a wrong basis (I think) and rejects all my edits which change ubuntu to Ubuntu (or some similar reasons).
As I'm the joker who also has the highest score on the other edit question and this does not seem to be answered, I'll throw in my 0,02€:
Edit the very unclear, difficult questions that need a lot of help first
Leave the small edits where you just change 1 character to when you've reached 2000 rep (back in the stone age, when I was a beginning user, that's what had to be done, but the rules might have changed in the meantime)
Once you've become a reviewer and not an editor, don't forget how difficult it was to be a beginning user!:-)
Don't edit just to format until you've reached 2000 rep.
Translate if you speak multiple languages
Change the sentence construction if it makes things clearer
incorporate comments into questions / answers
Don't be exasperated by one single user who's just taken 10 minutes to edit one question or answer and then sees one that took 2 minutes: he's as human as you. (I'm not: I'm an alien being made out of pure energy)
P.S. and don't forget to think! Cogito ergo sum! :D