There is a lot of helpful information available through the internet from reputable sources.
The following websites provide some general information about PTSD and CPTSD along with some downloadable resources that may be helpful:
https://www.ncmh.info/conditions-we-study/post-traumatic-stress-disorder-ptsd/
https://www.nhs.uk/conditions/post-traumatic-stress-disorder-ptsd/
https://istss.org/public-resources/public-education-pamphlets.aspx