Okay kiddo, so sometimes people talk about someone being "tall, dark and handsome." This usually means they think that person is really good-looking!
"Tall" means that the person is taller than most people. When you see someone who is tall, they might seem like a giant or like they can see things that you can't!
"Dark" usually means that the person has dark hair or dark skin. When someone has dark hair, it means their hair is brown or black instead of blonde. When someone has dark skin, it means their skin is darker than most people's.
"Handsome" means that the person is really good-looking. They might have a nice face or a great smile that makes people really like them.
So when someone says "tall, dark and handsome," they think that person is really good-looking because they are tall, have dark features like hair or skin, and just have an overall handsome appearance!