For those merchants who want to SEO optimize their Magento 2 websites, this infographic created by Amasty seems to be a good starting point. Here you will find all the default SEO settings of Magento 2 with their pros and cons as well as directions where those tools can be found within Magento 2 admin panel.
Magento 2 SEO settings cover most important things to succeed in the battle for top rankings: meta tags for products can be automatically generated which saves lots of time; schema markup is added to all the product pages, so they will get rich snippets in SERPs; site indexing by Google bots has also been made easy since in Magento 2 robots.txt can be edited right inside the admin panel.
There are many other SEO settings available in Magento 2, they are fully covered by the infographics below. By the way, you can save the image and use it for further references.