Using USB Host-Host cables

I have purchased a  based on the PL-25A1 chipset.
I'm of the opinion that this path is a better fit for me than using any 
thing with an Ethernet cable.
Although a Debian user, I post here as the underlying motivation for LFS 
is understanding your system. I'm retired and my avocation is learning 
about Linux.

The cable is recognized by Debian Stretch.
I have found relevant bits-n-pieces in manpages and package info.
I'm missing background in:
    USB interfacing
    networking (in a broad sense)

Suggestions for where to read &/or search terms?
Has anyone here used it to connect tow computers?
I date from era when RS232 null modem cables were SOP ;/

TIA

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