probably not the answer you were looking for but...all of them lol All topics I'd like to learn more about for sure. But if I had to choose, I'd pick "Replacing Capacitors to ressurect Enterprise RAID Controllers"...I enjoy the hands-on stuff the most. Can't wait for your vids.
Same here: All of it please. But if I had to choose: Home Network, VLAN, AP as client, PFSense... All work related, in all cases I have some knowledge and would love to hear/see what you are doing with it. And where I was wrong ;-)
Wouldn't mind seeing you solder some capacitors, would like to see your technique of doing it :) And I think the home network security idea would be great for beginners (Don't want to know how many people still us WEP)...
Home network for sure and I would enjoy watching you repair any PCBs. I just replaced a fuse holder on a control board for an espresso machine and would like to see how you would do it. You could make a video on making jam and I would watch it.
These all look like good ideas, but here are some thoughts on two in particular that I'd find interesting.
VLANs would be a really interesting one for me. They seem like a pretty straightforward idea, but then when you get into it there's all these details: different port types like trunk, customer, general; MVRP/GARP; untagged/tagged; double-tagging, does it work over wifi, etc.
I think if you do make a video on this, what I would really like to see is some practical demonstrations that show how things work. For example, set up a trunk port and show some tcpdump or wireshark output and point out, "ok here's some traffic on the trunk port, we can see all this untagged traffic that's from here, and these other packets are tagged with some different vlans, this is what nested traffic looks like, this is what you get when you switch the port to that mode, see I can send this and it comes out like that..." etc. So don't just tell me, show me, too.
With pfSense, one thing I see people confused about occasionally is that it's not really intended to be used as a switch on the LAN side. People hear router and think about their all in one plastic box, and just assume they should throw a bunch of NICs in to get a bunch of ports like they have on their Linksys or whatever. Really the interface is not designed with that in mind, and what they actually need is an external switch, not a bunch of NICs. A bunch of ports is great if you need separate LANs or a DMZ or other stuff like that, but trying to bridge multiple ports and set the bridge as the LAN interface is a pain in the butt through the web interface. Anyway I digress, I just thought I'd mention that in case you have noticed that or similar gotchas (WiFi for example) that might deserve mentioning in a video.
Myths and preconceptions about VLANs e.g. a "your doing it wrong" part where you show how VLANs can make one's life easier but are overlooked most of the time.
Regarding PFSense: General information about packages you consider a must-have and network auditing using PFSense (Traffic-monitoring, Intrusion detection, Broadcast issues...)
Designing and protecting your home network as a start (because you have to have a solid network before you can improve it with the rest of the aforementioned topics)