How can my world send players or entities to other dimensions with commands?

For novice players, the specific operation process is as follows: under the premise of playing games with the server, get a command box with your name written on it, which is our own unique command box. Then, enter the command in the command box. Wait a few seconds, it will be transmitted.

For novice players, the specific operation process is as follows: under the premise of playing games with the server, get a command box,/say your name, which is our own unique command box. Then, just enter the command in the command box.