Forge points are mainly used to research technologies and upgrade Great Buildings.
Fair Trading The system has a check-mark Fair Trade. If it is active while creating offers, the system automatically calculates the amount of the other good in a ratio of 0.5 (when the offered good is of a lower age), 1 (if the offered good is of the same age), or 2 (if the offered good is from a higher age).
To buy Forge Points, you just click/tap on the plus sign next to the FP bar. A window will show giving you the option to buy FP with coins or Diamonds. To invite players that do not currently play, I believe you have to provide their email for Inno to send them an invitation.
The way of acquiring those resources varies from event to event but mostly they are awarded for completing event quests. Those resources can be traded in for rewards or are used an an intermediate to procure items which may give the rewards.
-open the GB, go to it's 3rd label and select a friend. once per day, you get the same amount of goods that your friend collected from his/her city. the goods are from the era of your friend. -whenever you level up one of your great buildings, there is a probability to get X% of the first place reward.
Goods are produced in goods buildings. They are unlocked through advancing in the technology tree.
Players in SAM and SAAB can put goods buildings on the colonies. Those you can not see. Also special event buildings can give a lot of goods. A recent event building like the Airship you place because of the 9 fp, but it also gives 20 goods.
The main source of population for most players is residential buildings. Those are easily accessible and require only coins and supplies (or diamonds for premium buildings) to construct.
Click on the "Create Offer" tab. Next to the words "Your Offers", select the good and the amount of that good that you wish to offer for trade.