If you are new to Aventum you probably should start from Getting Started section.
If you want step-by-step instructions on how to create a blog with Aventum please check the Tutorial section.
If you are building your front-end app then probably you will be interested in Frontend section.
If you want to deep dive into the Aventum world you probably should check the Deep Dive section.
If you want to go deeper and learn Aventum's API and how to build an Aventum extension you should go straight to the API section.