Avoid the CSS Method
Now some WordPress tutorial sites may show you a CSS method that uses display: none to hide the footer credit links.

However doing so will put your site’s SEO at risk. Google does not like hiding links with display:none because that’s a technique that spammers use to hide the links from users while still showing it to Google (in hopes of higher rankings).

Your site might get flagged, and it will cause you to lose your search engine rankings.

So whatever you do, do not use the CSS method like this:

#site-info {display:none}
While it looks simple, it’s not good for SEO.