Hide page from User

I want to hide a page from a user,(user_id == 3). It could be any page, I just want to know how to hide a page from that specific user.

There are so many php functions that I’m not sure where to start with this one being a newbie here.

Maybe someone could transform this?

`<?php $user_id = get_current_user_id(); ?>
<?php if ( $user_id == 3 ) { ?>
<p>This text is only visible to user 3.</p>
<?php } ?>`

If not, no worries. All I really need right now is a lead, which WordPress tags should I be using to do this?

Thanks in advance!