What is google structured data markup tool

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Structure data is parts or list of elements in your blogger what the clasification and what describing on the part on your post page like url, description, body of content, title, date, author, contact information, title site, site logo etc. so Google and reader Understand what important amount data you write so Google detect information on your blog site and they put describe information in search engine result pages on Google Search  engine and other search engines like bing, yahoo, yandex search engine.
Good schema seo that everything in post article and all on your blogger blogspot site use mark up with best seo practice for site rangking in search engine so your article covered in search result without visitor headache what they search in .

Search Engine uses Structure data to generate rich snipet what important  information in blog site. Keyword isn't used by google now, make sure you fix structure data and make search engine and google understand what we write.

You can find list structure data markup validator and report what error markup on your blogger site using Google markup tool in Strutured data testing tools or you can use schema markup tag helper for your site you can find in the below of google search console.
You can use structure data helper to mark up your website for structured data covered your all website contents for web rich snippet you can use google rich snippet tool for covered and describe your all content base markup.

What structured data format google official Google site that them supported Json-LD use java script for tag information about your site in search result. You just put java script code between head tag, it's highly recomended by google to use structure data in Json-LD format.

Google supported Microdata, is an open community html to nest in body to inform data, Json-LD can be tag in html on body and you can place between head too.
RDFa google supported too, is use html5 extention that support link data for html tag for describing what in your site to  visible in search engine result page.

Google said that them supported Microdata 

If you want simple you can use Json LD for markup your site.