Google requiring certain properties for certain types when adding Schema.org markup?

Question

I tried to add Schema.org markup on my site, with the type Article, then adding some properties on it, when checked on Google Structured Data Testing Tool, it said

Answer 1

These are required/recommended for getting one of Google’s search features.

If you don’t want that Google search feature, or if you can’t provide all necessary properties, you can keep everything like it is and ignore the errors and warnings.

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