Lucas Wright demonstrated how to create an open textbook using the Pressbook. Here is a link to the Pressbook that he used to present with in the session as well as the session slides:
https://pressbooks.bccampus.ca/idcoppresentation/
https://docs.google.com/presentation/d/1AY5PMAHh2V8o46_xJAMmnjHBqfuUYy366Q0j2mS2kls/edit?usp=sharing