Tips for CAD Stretch command

The Stretch command is a simple and special command: on one hand, it’s as simple and easy-to-operate as the Move command, on the other hand, it has different ways from other commands in selecting objects. Why is that? When using other commands, we need to either select the whole object such as the commands of Move, Rotate, Copy, Mirror, Zoom, or click on the part that we want to edit such as the command of Extend, Trim, Lengthen and so on.