There are technically correct ways to write an outline for a message. But more importantly, there is a point to having an outline. Some people can do a perfect outline in form with every indent and numerical marker correct. However, some people who can do a perfect outline, still don’t achieve what the outline is meant to achieve. It is designed to reflect the shape of thought. It’s purpose is to give a visual representation of the flow and shape of thought. It is supposed to present visual ratios of spoken content, relative importance of message elements, etc.
If you have perfect outlining technique, great. But make sure your outlines are helping you preach. Ultimately it’s not what you have on paper that matters, but what is said in the message. However, this does not mean we can dismiss outlining altogether. If your technique is not perfect, but it accurately reflects what you plan to say, perhaps that is good enough. If your technique is perfect, but somehow it doesn’t represent the message well, that is not good enough. If your preaching is good, but you have no idea how to outline well, then it would be worth learning in order to augment the preaching.
There are many such supportive techniques associated with preaching. It’s good to learn them well and it’s good to use them. But it’s even better to make sure that our preaching is the best it can be, and not have a false confidence from skill in supportive techniques alone.