If you find an error or a gap in this book, or a recommendation that you disagree with on the basis of practical experience, you are most welcome either to raise an issue, or even better to draft updated or new text. We are maintaining this book using GitHub - see the book6 repository.
You can raise issues through the book's issue tracker. General discussions also take place here on GitHub.
To become an active contributor check the conditions and instructions. Then submit GitHub PRs. Your contributions will be reviewed by an editorial team.
There is a short code of conduct for participants.