Naming of the Parts

I am migrating several Aperture Libraries to Capture One. I am an Aperture Certified Professional, and was active in Apple's Aperture user-to-user forum. One of the first difficulties I encountered when learning how to use Aperture was obtaining actionable definitions of the parts of Aperture, including how they inter-related. Later, I wrote this User Tip to explain to others what I thought was missing. (It was immediately apparent that many users were in the same quandary.) It covers, briefly, what the database is called, what the atomic record is called, what is saved in the atomic record, what containers are available to group records, and how those containers inter-relate.

Can anyone point me to an equivalent for C1P? My Aperture-bias leads to look for an equivalent of Ap's Projects — in particular a "home" container of the atomic record (broadly, the "Image"). Afaict, the equivalent in C1P is the container named "All Images" that resides in the (to me mysteriously named) container "Catalog Collections". Is there a clear graphic that identifies the icons that are prepended to the names of the containers that are listed in the Library panel?

Additionally, it seems that C1P's designers have followed Aperture's (wrong and harmful, imho) lead in allowing users to conflate "image" with "file", and to use "photo" without discrimination. Is this so?