An outliner is a tool that helps you organize information in a way that is easy to understand. It is like a map or a road that helps you get from one place to another.
Imagine you are making a list of things you want to do at the beach. You might start with "swim in the ocean," "build a sandcastle," and "play beach volleyball." But then you might want to add more details to each activity, like "bring sunscreen" and "invite friends to play volleyball."
An outliner lets you do that by letting you create a main topic, like "beach activities", and then add subtopics, like "swimming", "sandcastles", and "volleyball." You can then add even more details to each subtopic.
The outliner helps you see the big picture of what you want to do at the beach, and then break it down into smaller, manageable parts. It's like having a plan or a blueprint that helps you organize your thoughts and stay on track.