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https://www.udemy.com/course/strukturierte-daten-wordpress/

Erzeuge so genannte Rich Snippets in den Suchresultaten bei Suchmaschinen.
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56min of on-demand video
Created by Florian Simeth

thanks it is good for learning rich snippets
for google

This course is really very good. The teacher is the developer of many wp plugins like:
https://codecanyon.net/item/snip-structured-data-plugin-for-wordpress/3464341
and other good plugins.

In English
here one can read about structured data
https://rich-snippets.io/structured-data-training-course/?pk_source=codecanyon