Please provide the details , did you try with CUG page path deny in cache rules?

did you check your cache rules?you can deny cache of this page ## Don't cache login token or pages/0220 { /glob "/libs/granite/core/content/login*"/type "deny"}

you can not hide the user ids.you can deny the access to those nodes by external systems by updating your dispatcher rules.Apply dispatcher filters. ## Deny content reading by queries and prevent un-intended self DOS attacks/0033 { /type "deny" /selectors '(feed|pages|rss|blueprint|infinity|tidy|sys...

you can try with jquery $('div:customDropdown').<<<apply logic>>>>;</span>

You can very easily integrate 3rd party chat tools on AEM.It is as simple as adding their JavaScript to the page.Link:- https://www.tawk.to/Link:- https://www.purechat.comLink:- http://helpcenterlive.com/  https://experienceleaguecommunities.adobe.com/t5/adobe-experience-manager/chat-tool-for-aem/qa...

AEM will not work on OpenJDK

https://experienceleague.adobe.com/docs/experience-manager-65/deploying/introduction/technical-requirements.html#server-operating-systems check server operating system section, it will support - Linux, based on Debian distribution incl. UbuntuSupported Platforms: Java Virtual MachinesOracle Java SE ...

You can try creating new project with Aem arch typehttps://experienceleague.adobe.com/docs/experience-manager-core-components/using/developing/archetype/overview.html?lang=en#system-requirements https://github.com/adobe/aem-project-archetype 

Are you adding only empty tags? <div class="some-class"></div>try adding a  <p>&nbsp;</p> <div class="some-class">&nbsp;</div>

Did you get a chance to check the user "admin" permissions in useradmin pageReplication is enabled or not?, for admin user should have full control. Is this in your local environment?Do you see any errors in error log file?