With SEO being such a big part of web development, it would be good to know some tools to help evaluate progress and how well your optimizations are going. Thankfully there are numerous sources to reference as well as free easy to use tools that will come in handy.
If your project is to SEO an existing site I’d recommend running some of these reports before beginning the project. This will allow you to show the client or whomever at the end of the project how well you were able to improve their site. It will also give you an idea of what to look for if you are unfamiliar with SEO or what needs the most work on a particular site.