Bevertje said:
I like your guide for the beginning of the game, when can we read the sequel?
I don't think I could even try to sum it all up the way I did for Ancient. This game gets exponentially more complicated the further you go
I can, however, throw out a couple random observations about Classical:
1) Compared to Ancient and Medieval, the techs as a whole are not that earth-shattering. Looking carefully at what the techs give you and discarding the not-as-essential ones may allow you to skip a few and get into some of the juicy Medieval techs sooner.
2) Mathematics is a massively important tech, because it is *required* to get to Construction (catapults), Currency (markets), and Calendar (hooking up plantations). It's rare that I haven't grabbed it early.
3) In the games I've played, the AI has usually been more concerned in Ancient with getting their own house in order than bugging me. Entering Classical is usually about the time you get deluged with missionaries, tech trade opportunities, and open border requests. I've used entering Classical as a good opportunity to assess my foreign situation and decide who I want to open borders with, who I want to cultivate as a friend, who (if any) I want to get ready to attack, etc.
4) There is only one military addition in Classical (unless you have Ivory): catapults. They are pretty much essential if you want to attack someone, at least at the higher levels. On the other hand, though, if you spend a long time in Classical, you'll still be sitting on the same swordsmen, axemen, spearmen, archers, and horse archers you built in Ancient. This means a) if you neglected your military in Ancient, you have a good chance of recovering as long as you don't wait too long, and b) if you did build a good military in Ancient, getting to catapults can be a good time to rush if you're next to Gandhi and he's too busy building fast workers or something

Or you can beeline to the Medieval military techs while accumulating commerce and attack after you upgrade. Bottom line is: Ancient military units will be around for a while, so use this knowledge to your advantage.
5) If Ancient is about nurturing your leader traits and resources, Classical may very well be about acquiring some sort of balance. Now that the AI is paying attention to you, you need to make sure you're not too weak in a way they can exploit (because they will). Also, going too hard in a certain area of the game gets more and more likely to get you into trouble. If you're Expansive and think to yourself, "Wow, I have these sweet big cities--I'm going to build even more!" you're probably going to tank your economy (and your tech pace by extension). Same with being Aggressive and building too much military. Founding a religion and trying to nurture that can really screw you if you take that too far too. This game seems to be designed so that you will really be punished if you try to leverage your strengths at the expense of other areas. When you expand anything (your territory, your religion, your military--even your culture), you have to ask yourself, "What is this going to do to the other aspects of the game?" Your strengths should still be your strengths, but enhancing your strengths *will* make your weaknesses even weaker. So you need to think about that the next time you go for your fourth wonder in a row or build your third missionary before 2000 BC.