Networking
Here I'll discuss the software side of networking.

pfSense vs OPNSense
pfSense SHADY; OPNSense not so much 

 For real, I'll write more about this later.

Custom Firmware
This is fairly dead for SOHO routers but you can still install it on the same hardware as pfSense or OPNSense, if you want a more simple alternative.  Talking about stuff like OpenWrt. 

 I'll write more about this later.