How to give super administrator rights in CMS Wordpress easier and more convenient?

Question

WordPress

The essence of the question is this.
What is the best way to give rights to administrators in the WordPress superadmin admin?
I even found an article in which a similar mechanism is described - link
But I don’t want to screw up anything, so I’m interested in the opinion of people who have done this procedure.
I also read that you can add a user simply to the wp_sitemeta table, but I'm not sure that the role will change.
I'm also interested in whether it's possible to simply add a variable to function.php and whether it needs to be deleted after the user's status becomes super admin.
In general, I will be very glad to receive feedback from people who have experience in this procedure.