I’m not familiar with the Ben Eater series, but there are certainly a couple options to check out.
Mark Ferneaux did a fantastic series on the workings of pfSense. It’s a little dated, but the core concepts are still sound and apply to networking generally.
There are also several sites that do in-depth networking topics with a focus on certifications. My favorite of the bunch is Viatto.
I also quite like The Network Berg, though his videos are specifically focused on Mikrotik.
The thing that immediately came to mind was mailpiler.org. It’s been on my list to stand up for a while, but I’ve never got around to it.
I can’t give direct experience here, but this is exactly the use case I’ve been meaning to spin up mailpiler for: https://www.mailpiler.org/. One of these days that will rise to the top of the priority list.
I think it’s just a matter of getting used to it. I had the same issue at first and the more I used the command line, the more I started to prefer it to GUI apps for certain tasks.
A couple things that I use all the time:
cd - goes back to the last directory you were in (useful for bouncing back and forth between locations)!$ means the last argument. So if you ls ~/Downloads and then decide you want to go there, you can cd !$.:h removes the last piece of a path. So I can do vim /etc/network/interfaces and then cd !$:h will take me to /etc/network.
In my state (Vermont), the Secretary of State has an rss feed that basically presents the results as an xml file. I’m using that to make some local results spreadsheets. Could be other states have similar things.