Brand guidelines fail when they are written to impress instead of to help. The best ones are short, visual and answer the questions people really have on a Tuesday afternoon.
Show, do not just tell
Pair every rule with a good and a bad example. People learn faster from seeing the logo used correctly than from a paragraph describing clear space.
Include ready-to-use assets
Templates for decks, social posts and documents turn guidelines into action. If using the brand correctly is the easiest option, people will do it.
Keep it alive
Host guidelines online, version them and update them as the brand grows. A living guide beats a perfect PDF that is out of date.