what do you do when you are in the middle of the game?
well im playing tiny map right now - i have 8towns/cities and i noticed there is a limit in world map of cities.After that the corruption will start grow.
Do you really take care of enemie cities after you capture and give them time to grow or you just destroy enemie cities and leave them with no buildings and in idle ?
Why? because its certain even in tiny world there is about 30cities or more?
That's a BIG question, and much discussed! Look around the forums. Search specifically for "corruption", "OCN" which is the "Optimum City Number" - once you have more cities than this, corruption starts getting really bad, and/or "raze/razing", which means not keeping enemy cities but razing them. You get slaves, but at the cost of annoying all other AIs.
[EDIT: the OCN is the limit on any
one civ's cities, not on total cities. Your corruption with >30 cities of your own will be bad - the AI civ with 28 won't feel this effect, yet].
(Razing really mean just razing the enemy city and building one of your own - it's not really about corruption, since that's unaffected, but about resistance).
You have to take care of enemy cities (or your own replacements, if you raze'n'replace) to a certain extent, because that's the only way to get cultural territory (otherwise the enemy will just re-settle there). But it's a hard question what to do with some very corrupt cities.
What I do is put up a cheap Library/Temple if I can (i.e. if my civ is Scientific or Religious) to expand culture, then emphasise food and take as many people off the land as scientists/taxmen as I can. This is surprisingly efficient - scientists/taxmen are not affected by corruption. The Civil Engineer (needs an advance, I forget which one) is also very useful to get buildings up quickly.
After that - build Wealth? I've never known really what to do with these cities. Others have different ways of dealing with it.