In his best selling book Paul Waddy mentions Plug In SEO: Search Engine Optimization as one of his top 10 favorite apps.
Plug In SEO makes many of your SEO-related tasks a whole lot easier. For example, it offers you templates for editing meta titles and descriptions in bulk and it detects broken links. It even has a keyword suggestion tool, which is great for your new store.
Paul Waddy – Shopify for Dummies