You can also grant access to an individual user on a page, but we advise against this method. If an individual users (instead of groups) are granted permissions on a pages, then you have to individual pages to manually change permissions instead of adding or removing users to user groups.
To grant access for users to a specific page or section:
New sub-pages automatically inherit the settings of parent pages.
Learn how to create conditional content on a page that only specified users can see.