Good to know. For newer users of adclient, I recommend:
Server Suite Cheat Sheet: https://community.centrify.com/t5/TechBlog/TIPS-A-Centrify-Server-Suite-Cheat-Sheet/ba-p/22568
Start here (personal blog, not updated in a long, long time): http://centrifying.blogspot.com/search/label/Start%20Here
MFA on Express:https://community.centrify.com/t5/TechBlog/HOWTO-Implement-MFA-on-Centrify-Express-for-UNIX-Linux/ba-p/23695
Primer on trusts: https://community.centrify.com/t5/TechBlog/A-Primer-on-Centrify-and-Active-Directory-External-One-Way/ba-p/21327
High-availability controls: http://centrifying.blogspot.com/2014/05/security-corner-centrify-unix-agents.html
Foundations:
NSS: https://en.wikipedia.org/wiki/Name_Service_Switch
PAM: https://en.wikipedia.org/wiki/Pluggable_authentication_module
Kerberos: https://technet.microsoft.com/en-us/library/cc961976.aspx