You want to write a guide or build a resource, but cannot decide how detailed it should be. A beginner and an experienced person need different explanations. Without an intended audience, you may keep adding background that nobody has asked for.
Choose a specific kind of person who would use the first version. Describe what they already know and the task they want help with. If appropriate, ask someone in that situation what information they find difficult to locate.
Make one useful section first
Build a small part that answers the identified question. Share it with a willing reader and ask where they became confused or still needed information. Avoid asking only whether they liked it, since that gives you little to revise.
Use the response to improve the section before expanding the whole project. If the intended audience changes, revisit the explanation and scope. You can create for yourself as well; in that case, name the future task you want the resource to help you perform and test it against that task.
