The section you refer to is where you will find most information. There are a number of examples there that can be a good starting point for you, so check out this page:
Code samples of capabilities and use cases of Qlik Sense .NET SDK ‒ Qlik Sense Developers
From an earlier post you had, it sounded like you might want to extract data from Qlik Sense through the .Net SDK, and in that case I can recommend reading up on the concepts of generic objects and hypercubes. You can find an example of how to use them through the SDK here:
GitHub - kolsrud/qlik-dot-net-sdk-hypercube-usage
And there's a section describing data retrieval here:
Retrieving data ‒ Qlik Sense Developers
