Everything in the link below is what you will be tested on. Use this as the authoritative source for the exact domains and topics to study up on. I also recommend reading through the CCSK study guide as another source of study material. The official study material related to the CCSP will give the the right amount of depth needed to pass. Some topics within the domains might cross over to the CISSP but it will be covered in enough detail with the official CCSP study materials.
CCSP-Exam-Outline.ashx (isc2.org).
I recommend joining the CCSP Study Group here: https://community.isc2.org/t5/CCSP-Study-Group/gh-p/CSSP_Study_Group