You do not need to be listed in other RDFs to have entities recorded around the content you create. You can define your own entities on your own web pages. When a search engine such as Google comes to see your site, they will see the underlying structured data on the page, which will allow them to easily categorize the content.
Here is full documentation on structured data from Schema.org. However, as this is the beginners guide, here are some quick and easy ways to understand, organize and add structured data to your pages.
Unless you are used to working with code, it can be very difficult to understand what structured data is already on each page of your website. Fortunately, Google provides a simple to use structured testing tool. You do not have to own a website to be able to use the tool. It works on any site.
Figure 4 Google’s Structured Data Tool Output
Tip: Use the structured data tools on your competition
There are many structured data tools. It is likely, though, that you have a few serious competitors in your niche. Some of these may have done a much better job than you at becoming an entity in their own right or at least becoming an expert on entities that you feel you should own. You can take two steps to view a data structure that might work for you:
1: Use Google’s Knowledge Graph Search Tool to establish whether your competitor’s brand or name is already properly defined in the Goodle Knowledge Graph.
2: Then use the Structured data tool on the best represented competitors’ web pages to understand how they used structured data.
Inlinks Writes your Schema Markup For You
This guide has largely tried not to sell you anything and has aimed to be independent. nevertheless, if you would like the luxury of having your schema written automatically, just get an Inlinks.net account. (#KindaSponsoredButNotReally.)
Yoast plugin for WordPress: Yoast’s plugin is one of several that will create your structured data for you. All you have to do is to decide whether your blog should be set up as a person or as an organisation. The plugin then uses your other setup configurations, such as your user profile and social media profiles to build out the structured data.
There are many other plugins that also allow you to manage your structured data on WordPress. A self-updating list is here. You should only integrate plugins with a large (10,000+) user base and one that is being regularly updated to work with your versions of WordPress. It is also probably good to only have ONE plugin trying to manage your structured data at any one time. You can make plugins inactive at the click of a button in WordPress if one plugin is clashing with another.