Can you please check /libs/wcm/core/content/sites/properties/libs/cq/gui/components/siteadmin/admin/properties/clientlibs/properties/js/properties.js .I will add if found something more

Hi You can tryhttps://github.com/AdobeDocs/experience-manager-65.en/blob/main/help/sites-administering/notification.md 

Any working solution for this article . The provided link is not working.

You can use JS to identify target elements and update HTML using meta tags.

Hi RajarshiRoy ${'cd' in currentPage.path}above correct if char exist in String. How we check not in. Because 'not' or '!' is not working.

I am looking for best approach for blog migration from WordPress CMS to AEM. Which one language is suitable for migration script Java or Groovy ? If anyone already implemented please provide steps or appraoch.

Add a dependency in second site so after module compilation classes get availble for use.

You can design form via <form> in html . You can call servlet via Ajax once submit button clicked. Prepare Java code for database connection and related logic.

Just replace mode ="merge"

Please check if you have multiple OSGi configurations for Error logs. It should not redundant and run mode specific.