• does trading among your own cities get you more resources, or are they simple transferred between cities?
• how much should I follow the recommendations for producing stuff? Sometimes it's useful but it almost never tells me to produce a builder even though they seem kinda crucial
• how fast should I be expanding? Should I be starting cities as much and as quickly as possible?
• is it me, or is it very hard to trade favorably or even equally with non-human players? They never seem to be OK with trading one resource for another. They always want some gold too.

I'm only on my second game so far, so still figuring things out. Enjoying it a lot though!