The tutorials are written for developers who are new to Apostrophe. They will walk you through the process of getting your environment set up, creating a basic website, and even diving deeper into some of the more advanced features.
Most of our documentation on how to develop a website with Apostrophe currently lives in the Tutorials. Feel free to skip around after you complete the getting started series.
If there's a specific question you're looking to answer, you may find the answer in the HOWTOs section.