What is the best way to prevent two users, with the same permissions, from modifying the same page at the same time?

Using the Lock Page functionality in the page properties of the Sidekick is the best way to prevent two users, with the same permissions, from modifying the same page at the same time. This feature allows a user to lock a page while they are making changes, thereby preventing other users from editing that page until it is unlocked.

When a page is locked, any other user who attempts to edit that page will receive a notification that the page is currently locked and cannot be modified. This mechanism ensures that only one user can make edits at a time, effectively avoiding conflicts and data loss that may arise from simultaneous edits. Once the user is done and unlocks the page, others can then access it again for editing.

Utilizing this feature helps to maintain the integrity of the content and workflow within AEM by ensuring that changes are made in a controlled manner, which is critical in collaborative environments where multiple users may be working on the same assets.