The WordPress dashboard can be confusing for users who don’t have any business being there. Remove Dashboard Access for Non-Admins is a new plugin that keeps users out of the dashboard. If a user does not have the ‘delete_themes’ capability, he will be redirected to your site’s homepage.
In the future, the plugin author plans to add in the option for you to select the capability type by which to remove access to the dashboard. Download Remove Dashboard Access for Non-Admins from the WordPress plugin repository.