Well let give you a Run Down.
As related to Networking, there is two kind of public forums.
Forum like this one that has all the Network Traffic under one umbrella, or as DSL Reports.com does. I.e. having 50 sub forums, might be that in one day the DSLReports Forums generate more threads but it is across so many sub forums that makes it impossible to enjoy.
Out of the forums, that I am familiar with this forum generates the Most traffic per day.
Forums by nature are not a place for Articles, Reviews, and Guides, they attract people who have problems and need help.
If you want to read about practical Networking, you must target a topic and then use search engines. It would take some time to learn how to decipher the search outcome but at the end you can build a nice list pages to read.
Take it from some one who is much older, complaining is a waste of ?NeuroBandWidth?.
Example of Entry Level,
http://www.microsoft.com/technet/prodtechnol/winxppro/deploy/p2pintro.mspx
Eaxmple if you target Windows Securtiy issues,
http://www.windowsecurity.com/
:sun: