The authoring manual contains detailed information on almost every topic you need in authoring. It can be found by clicking on the lifebuoy icon in the author environment:
For SOWISO users, it can also be accessed via this link and for Bolster users, it can be accessed via this link.
The main topics in the manual are listed in a horizontal menu at the top of the page. The sub-topics per main topic are listed on the left of the page.