Reading the handbook does not require an account. A WordPress login is only for the person editing the site.
Messages you send
Until you add a form plugin, visitors reach you by the email address on the Contact page. Change that address in the editor. Do not ask anyone to send passwords or payment details.
Studio
Only a WordPress administrator can edit these pages. Sign out on a shared computer when you are finished.
Search
Search runs against the pages on this site. The query is part of the address, which a server log may keep.
Third parties
Links to minecraft.net, Google Play, the App Store, and Minecraft Education leave Blockhaven. Those sites have their own policies. We do not run an ad network on these pages.