Wikipedia:Training/core/Pillar 5

Wikipedia does not have firm rules.
 * Rules in Wikipedia are not carved in stone, as their wording and interpretation are likely to change over time.
 * The principles and spirit of Wikipedia's rules matter more than their literal wording, and sometimes improving Wikipedia requires making an exception to a rule.
 * Be bold (but not reckless) in updating articles and do not worry about making mistakes. Prior versions of pages are saved, so any mistakes can be corrected.

A lot of Wikipedia editing is about using your best judgment, and you may be asked to explain the edits you make. Explaining why you decided to do something is just part of being in a community of people.