Hi @ajinkayk6258253,
@raghavc gave you the right answer so you can approve it, but I thought I would a bit more information for context.
Here is the ACE (Access Control Entry) that you need to apply:

If you are unfamiliar with ACEs, you can find the user interface by going to Tools > Security > Permissions.
And here is the before and after:
BEFORE

AFTER

One more thing: your question is about hiding the insights tab from a particular user but in general its is strongly recommended to use a user to identify a particular person or service, but a group to attach ACEs. You would then add users to groups based on which rights they need and what their role is within AEM. This is much cleaner, much more semantic and makes your configurations re-usable in the future 🙂