You can easily configure this functionality by creating a new role that's responsinble for managing blogs. If you assing a user to it, and check the This user can access the site Backend checkbox, by default the user will be able to see the Pages and Content nodes in the Dashboard menu. Under Content only Content blocks option will be visible. What you'll need to do is log in as administrator, go to Administration->Backend pages and deny view permissions for the Pages backend page and Content Blocks backend page for that particular role. Once you've done this, your user will see no links in the Dashboard menu. You'll need to go to Content->Blogs and click on the permissions section in the right sidebar of that page - you can then configure the necessary permissions for your role, as per the desired use case scenario. For your convenience I've recorded a sample video demonstrating how you can achieve this, please find it attached to this reply. If there's anything else we can help you with, please let us know.
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