Conservative configuration of the PS1 variable

I need to create global variable environment PS1='[\u@\h ttyid:\l \d \t \W]\$ '? I used command

$ export PS1
$ PS1='[\u@\h ttyid:\l \d \t \W]\$ '

Is that correct?

After that A conservative configuration of the PS1 environment variable is required for subsequent startup of the operating system by creating a suitable configuration file using the text editor.