Yeah, these forums are great! I started lurking in '08 and was a mediocre Monarch player. I could win sometimes but it really took some "luck". But after reading some stuff here I realized how much I was missing out and was really able to fine tuned my game, particularly with city specialization. Now I play pretty well on Emperor. I don't win every game, but I'm much more aware of what is going on and know the reasons why I may win or lose a game instead of falling back on "I hate the AI! They always cheat and dogpile me!".
This forum has helped me with:
specialization
whipping/chopping (back in the day, I rarely used this)
diplomacy
tech priorities
worker priorities (food)
early rushes
overall warfare
seige, seige, seige (rarely built in the past)
I could go on an on....