The main idea is a sentence that provides the subject for discussion; it is the topic sentence. A list of details usually supports it. If you can tell what the supporting details have in common, you can discover the main idea. You can either choose to create the main idea and details chart using complex tools or opt for EdrawMax Online that helps you create a professional-looking Main Idea and Details Chart easily and quickly. The below chart illustrates that the main idea showcases a tree diagram and illustrates how a kid is talking about an apple tree and asking a question at the end, "What is the main idea of the story?"