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This is a bible of sorts for learning about networking concepts and protocols: http://index-of.es/Varios-2/Computer%20Networks%205th%20Edition.pdf
As for practically making things work, it entirely depends on the kit you’re using and its implementation of those protocols and its user interface. Manuals, forums, Slack groups, IRC channels etc dedicated to the particular platform/piece of equipment are your best bet.
I find YouTube ‘tutorials’ mostly useless as they’re often made by people with a poor grasp of networking themselves, and are unwatchable.
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I'd like to know about VPNs and remote control of a laptop (for example I'd like to see if it's possible to control focus / exposure on a camera through a switcher connected to a laptop that I send out to client and then access remotely).
What you are looking for is https://tailscale.com/
This is the modern thing everyone is doing. All your computers and devices on the same logical network even when they are remote. If you can control them locally, then you can control them remotely.
If I wanted to learn more about networking how would I go about that?
Are there recommended resources / books / youtube channels? I don't have anything specific, I'd just like to know more and be less reliant on others.
I'd like to know how certain bits of equipment fit into our workflows for example on live / remote shoots - what people use them for / what they can be used for.
I'd like to know about VPNs and remote control of a laptop (for example I'd like to see if it's possible to control focus / exposure on a camera through a switcher connected to a laptop that I send out to client and then access remotely).
I'd like to know more about networked storage (local but also providing remote access to it for freelance editors) etc.
I've always had people sort this stuff out for me but figure I'd like to be a little more resilient and useful.