Each module has its own Section. Each Section contains an introduction chapter that overviews the core concepts. It is advised you read first the Overview page. Then you can decide to follow the guide from top to bottom or jump to between sections.
Game Creator is extremely easy to use. Despite this, sometimes certain features might require some extra explanation. Here's how this documentation describes highlights:
All our modules is a community driven product. That means that you can have a real impact on the direction of the development cycle. We internally have our own roadmap but if there's a community consensus that a certain feature should be implemented first, we hit the pause button and implement that feature.