Hello Noorali,
To get started using Amazon QuickSight Q, first get the Q add-on for your QuickSight account and specify the AWS Regions that you want the subscription to be available for. Pricing for the add-on applies to your entire QuickSight account and isn’t specific to a Region. After you subscribe to Q, QuickSight authors can create topics, ask questions, and share topics with QuickSight readers
Fore more info - Getting started with Amazon QuickSight Q - Amazon QuickSight
Sharing a topic allows your users to select the topic and ask questions about it in the Q bar. After you share a topic with your users, you can assign permissions to them that specify who can change the topic.
fore more info -Sharing Amazon QuickSight Q topics - Amazon QuickSight
Hope this info provides you all the details you are looking for.
Thank you.
Cheers,
Deep