SEO is a majot part of any website / blog to list on search results of search engines. Before, during the old UI, blogger had not supported SEO. But now, in new UI of blogger, the SEO fuctions are fully functional and dynamic. Now you can set meta tags for each posts and Robots tag separately.
This is the custom Post Meta description for each and every individual post.You can easily set and customize the Each post while creating it or editing the post area. It is placed on the left side of the post editor.