Is there a capability to add comments in the questions so that users have better idea to understand the question. Also can we add it in the dashboard as well.
Hi @tarundeep2005
You can add question description, which will be shown on the dashboard too as a little gray info-icon next to the question title, which you can hover to display. You edit the description by editing the question:
But if you're looking for annotations, then there's a feature request open for that:
Custom Chart Annotations · Issue #4838 · metabase/metabase · GitHub - upvote by clicking 
on the first post