A hand truck is a special tool that helps you to move heavy things more easily. It has a flat platform where you put the heavy object, and then there are two long handles that you can use to push or pull the hand truck. The platform is usually tilted at an angle, so you can roll the hand truck like a wheelbarrow instead of carrying the heavy object with your arms.
Using a hand truck is like using a magic helper that can make big, heavy things feel much lighter. You don't have to strain your back or muscles as much when you use a hand truck. It's a smart and efficient way to move things from one place to another without getting tired or hurting yourself.