If you want a completely empty home page, I suggest using the custom pages plugin and pointing your home page setting in the ACP to a blank custom page.
Otherwise, you can use css
can you please tell me the solution for this
Under "Manage>Privileges", you can select wether you want to edit the perms of a category, or the perms of "global".
You have to go to every category and edit the "guests" so all the boxes are unchecked.