In a brief announcement, Nathan Lambert says his long-awaited post-training textbook is now finished. The book documents lessons he gathered while working on open models, a process he describes as taking several years to write.
The post's headline points to five useful things readers will learn, but the announcement itself does not list or explain them. Only the existence of the book and its general focus on post-training are confirmed.
As of this writing, the source offers no further specifics about the content, so this article cannot describe the actual techniques or advice covered. Readers interested in the details will need to consult the book directly.