In terms of HCP learning I would first start with HCP HCSA. That should cover the basic questions like adding users, adding devices, configuring privileges, and etc.
https://elearning.hikvision.com/americas/certification/detail/320
Next I would do the Hilearning module for HCP, it’s quite long but it’s also quite granular. So that can help with the more complex questions
https://hls.hikvision.com/#/courseDetail?lessonCode=2023040300033&lessonId=26052&topicId=4240
Lastly I would use this document for quickly searching through the HCP manual to find key information (note this is for 2.6.1 and accurate information may require the old manuals)
https://pinfo.hikvision.com/hkwsen/unzip/20240822164538_35347_doc/index.html
The proper version manual can be found by editing the url v2-5-1 to v2-6-1 and scrolling down to user manual web client or user manual
to
Please see the following as well - https://techsupportca.freshdesk.com/a/solutions/articles/17000148561?lang=en