Welcome to the community.
Short answer - page restrictions. If you use a restriction on a page, the padlock near the top right, you'll be able to say "only let these people/groups see or see and edit this page".
The view restriction cascades - all pages under a page with a view restriction follow the view rule for that page (but can have more restrictions added too).
The edit restriction only applies to the page you add it to.
Note - you will need the "space permission" to restrict pages.
Hi @Sada Leuang
Look at this posts, maybe can help you
Hi, Confluence collaborators! As part of #Confluence-Collaboratory month, we’ve created a very special Mythsbusters segment, where we're dive into an interesting myth and uncover the truth behind i...
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