iText7 have execellent tutorials itext-jump-start-tutorial-for-net and itext-7-building-blocks.

But these tutorials talk more about how to create/manipulate pdf files. I wonder where is the tutorial about extract informations, such as text/image/path, from pdf files.

We can find some separated examples in text/image extraction on the web, but I can not find topics talk about concepts of text/image/path extraction and related classes of itext7.