One of my biggest pet peeves is when I have to edit a document someone else has written and they’ve manually messed with the formatting.
Microsoft Word has an incredibly flexible style system that makes creating docs that look great easy. It also makes easy for others editing the doc can keep things consistent.
This isn’t to say Word’s style system is perfect. Far from it. Many of the same styling bugs that existed in Word for Windows 7.0 appear to still be in the most recent version. For example, styles involving numbering and hanging indents are just wonky. But working around these is still better than trying to keep a document formatted consistently by hand.
Do not change the formatting of a paragraph, header, bulleted list, numbered list, or any other element smaller than a sentence directly. Instead either edit the current style or create a new style an apply it.