I recently wrote two articles about GoodData.CN where I am demonstrating how to use it with a real use-case. In the first article, you will learn how to connect GoodData.CN to your PostgreSQL database and how to scan that database in GoodData.CN. The second article is about data visualizations and embedding them into a web application.
The first part is available here: Build a Tool for Data Analysis — Connect Data.
The second part is available here: Build a Tool for Data Analysis — Data Visualizations.