The documentation should contain simple example and tips on how to easily create a parser with Grammatica. In particular recommendations such as starting with the tokens, using "--tokenize" and "--parse", adding productions one by one. As noted in a mail by Stefan Ukena:

Your hint in one of the previous posts about using "--tokenize" etc.to debug the grammar was very helpful. As was your hint to first define all the tokens and only after that the productions. Maybe you could put this sort of information in a more prominent place (like the docs)?