I need goods to unlock a technology. How do I get them?
There are two main ways of obtaining goods.
You can produce them yourself by constructing workshops according to your requirements, or you can trade with other players for the goods you need.
Keep in mind that different players get access to different goods producing buildings at different points within the same age. This means that some players will be able to produce certain goods earlier into the game than you, while you will be ale to produce some other goods earlier into the game than them. That's where the trading system comes in!