SEO Hub extension is a complete on page SEO solution for Magento. It allows store owners to add dynamic meta data and manage templates for products, categories and CMS pages. Through these templates you can manage meta tags like title, description and keyword for all products and categories and also product content like product title, description, short description and product urls. You can also set rules for maximum character limits for all meta data along with deciding the maximum number of products affected by applying the template sitewide. You can either apply template at once or apply it by cron. If you are not sure, you can also test apply all the templates to see how they work before going for final update.