Preview mode will allow a client to see what will be displayed on a Publish instance.  Depending on how the HTLs were written, there might be differences between what is displayed on Author Instance's edit mode and Publish Instance's publish mode.    Changing the mode will refresh the page, it shoul...

AEM supports the use of both Sling APIs and JCR APIs.  Docs on best practiceshttps://experienceleague.adobe.com/docs/experience-manager-learn/foundation/development/understand-java-api-best-practices.html?lang=enDocs on Sling APIhttps://sling.apache.org/old-stuff/sling-api.html Docs on JCR APIhttps:...