How to bundle and execute commands using && on Linux

If you enter command 1 && command 2, command 2 is executed after command 1 is completed, right?

Then

[Command 1, Command 2, Command 3] && [Command 4, Command 5, Command 6] In this way, if you want commands 1 to 3 to be entered (executed) at the same time, and after 1, 2, and 3 are all completed, how do you want to execute the decoration? Do I have to enter a command?