This book is probably our earliest writing, outside of the New Testament itself, of the teachings and tradition of the Early Christian Church.
In many ways --- in my opinion --- it reads almost as a summary of much of what is discussed by the Apostles in the New Testament. And, if so, I think that this makes sense. In the first and second centuries AD, the Church was very small and often operated underground due to the persecution and discrimination of the Roman authorities. As such, very few churches had a complete New Testament, much less a complete Bible. A book like "The Didache" --- brief, concise, comparatively easy to reproduce and publish in comparison with an entire Bible --- would make a good reference for ensuring that Christendom would largely remain similar and standardized in belief and practice, despite being scattered from Britain to Parthia and beyond and despite not having a complete set of scriptures to study and reference.
I'd heard anecdotally that The Didache contained specific guidance on how early Christians did worship and handled sacraments of baptism, Eucharist, weddings, and funerals. Unfortunately, I found none on either weddings or funerals. Regarding baptism, there is nothing in The Didache to suggest either that infant baptisms were or were not performed.
While this book was informative and did give me useful information on early Christian beliefs and worship, I can only give this edition 4 stars. Given its place in Christian history, I really think that work of this importance must have either have a preface in the beginning --- or some commentary within it to give readers a better understanding of it. Unfortunately, this edition has neither -- which would have been very helpful to readers.
I recommend this book for anyone desiring to learn more about Early Christianity and theology.