Schema Markup Generator
Use this schema markup generator to obtain a complete and validated schema for your webpages. You can use this tool for a new page or post you are creating, or for an existing page that is currently lacking of a valid schema snippet.
If you want to use it for an existing page, please input the existing page's URL. If it is for new content, please fill out the fields below, and leave blank any field you do not have.
Correctly structured JSON-LD schema help Google and other search engines to better understand what your content is about and put your pages into context by using entities and adding them to their knowledge graph.
Why is Schema Necessary?
Search engines (SE) deal a lot better with structured content than they do with unstructured content (though that is rapidly changing). Schema's highly structured format allows you to directly provide them with data which is clearly understood. Can you think of a better way to talk directly to Google?
Content is supposed to be written and presented very clearly, with a heading structure that should make clear to the SE what your content is talking about, but the reality is that is not always the case. Often times content is sub-part and confusing at best, making the jobs of the SEs even harder.
Your job is making Google and other search engine's job as easy as possible. You need to provide a complete sitemap, add accurate and valid meta tags in your header along with the schema, in order to increase your chances of getting your information to be added to different knowledge graphs.

Structured versus Unstructured Content
There are many simple things you can easily do to improve your website. First, you should submit your website's sitemap to the SEs, so that you make the discovering of your content a lot easier.
Then, your content should be clear and well structured, so that the main them and sub-themes are clearly detectable. Yet, regardless of how clearly laid out things are, the content we write qualifies as unstructured content, which is by definition harder to interpret.
That is why it is so important to create meta tags and schema, because such is structured content, which is easily parsable by Google and other search engines, and allows you to have a "direct conversation" with them.