Wireless home LAN - WiFi vs Bluetooth?

This is not LFS specific. But I've post to a LUG and a distro specific 
mailing list. No responses even touched on the my *EXPLICIT* question -- 
What should I be reading. Responders insist I should want what their 
identical setup. GRRRR ;<

Sneakernet for file transfer has become annoying.
Ethernet is undesirable in my environment so I am only interested in 
wireless.
I have only a few machines a max of 6' apart.
My usage would typically be peer-to-peer but I want to communicate 
between any two machines.
My web connectivity is via a T-Mobile WiFi Hotspot (WiFi turned off).
I run Debian 9.8.

I've just begun reading - primarily Wikipedia articles and some links 
from them.  My primary question is "What should I be reading?" in order 
to ask appropriate questions. Specifically "What?" and "Why?" much more 
than "Howto?".

A concern is security issues. Bluetooth, being short range, may thus 
have an advantage. Speed is not an issue for my expected usage. (I was 
one of my ISP's last 6 dial-up clients ;)

UPDATE:
Since originally posting the above, I'm focusing more on a WiFi than 
Bluetooth solution. Although I did find a Bluetooth article which gave a 
reasonably good description the topology/protocol I envisioned.

https://en.wikipedia.org/wiki/Personal_area_network says in part:
> A Bluetooth WPAN is also called a piconet, and is composed of
> up to 8 active devices in a master-slave relationship (a very
> large number of additional devices can be connected in "parked" > mode). The first Bluetooth device in the piconet is the master,
> and all ther devices are slaves that communicate with the master.
TIA




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