The central idea is what the text is mostly, or mainly, about.

Soccer players learn many skills, including how to dribble, pass, control the ball, and work together with teammates.

The main idea is what the text is mostly, or mainly, about.

Pirates steal gold from other ships.

It's important to eat vegetables and fruit.

The sun gives us light and heat.

Supporting details are facts or examples that help explain or support the central idea.

Look for repeated themes, the first and last sentences, and the main points discussed.

Dogs are loyal companions.

The main idea is the overall message, while supporting details provide evidence or examples.