Just wondering does editing your own question/answer cause reputation loss?
Yes or No?
If you do not have editing privileges, you may gain 2 reputation for suggesting an edit to another person's post if it is accepted. Otherwise, you neither gain nor lose reputation for editing posts.
However, editing is encouraged to make the site's content better, and is rewarded by a whole slew of badges (Cleanup, Copy Editor, Editor, Organizer, Strunk & White, Tag Editor, and Taxonomist).
There are many good posts on editing guidelines here on Meta, so search around for that if you need additional help.
No