Validation error: “The itemprop attribute was specified, but the element is not a property of any item”

Question

For better SEO I need put some meta on my page like this:

Answer 1

You should explicitly provide a type these properties (name, description, image) belong to.

In Schema.org, everything is a Thing. Thing has many child types, listed under "More specific Types". Start there and choose the most specific type for your content.

For example: WebPage, Article or maybe BlogPosting.

It could look like (using WebPage as example here):