Can you check if there is issue with your network?

https://experienceleague.adobe.com/en/docs/experience-manager-65/content/implementing/developing/components/internationalization/i18n-dev will be helpful.

It depends on what are your requirement for search functionality.

https://experienceleaguecommunities.adobe.com/t5/adobe-experience-manager/the-pointer-to-successively-passing-ad5-e113-aem-as-a-cloud/td-p/455879 is good article for the certification.

Hi,   You can apply the rule to your newly created column. As you know, column rules are applied from the top down. Also, they will be combined, but will not overwrite each other.

If you use the latest core component rich text component, you need to enable plugins via the Plugins tab. More details: https://experienceleague.adobe.com/docs/experience-manager-core-components/using/wcm-components/text.html?lang=en

Check https://experienceleague.adobe.com/docs/experience-manager-cloud-service/content/implementing/content-delivery/caching.html?lang=en for finding out about cache control.

Try replicating the issue in a non PROD environment. Also, try to get logs for the live environment and see if you can find something there.

Which AEM version are you using? Also, is there any specific component in which you face the issue?

Thanks @Jagpreet_Singh_ & @kautuk_sahni for the recognition.