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.
Generally you advance your city to increase the number of forge points (fps) you can collect from it each day. This can mean adding levels to forge point generating great buildings or adding buildings won from events or GE that make forge points.
To help construct a Great Building, simply visit a city of one of your friends, neighbors or guild-mates in which a Great Building construction is present, and click on the Great Building. You may now donate Forge Points, and also view which reward you will receive (if any) for your current donations.
Goods Spent Whenever a good is spent, its point value will be added to the ranking (research tree, Great Buildings, sector negotiation, donations to the Guild Treasury and so on).
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).
Forge Points Buildings Arctic Orangery. Winter Wonderland Pyramid. Abandoned Asylum. Innovation Tower.
-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.
The Trading Post is a special residential building given as a reward during the 2023 Summer Event. 1 Fragment of Buccaneers Bay Upgrade Kit.
In Age of Empires, trade is only possible between Docks, with Trade Boats or Merchant Ships. Note that, unlike in later games, trade costs resources, and Docks take 20 seconds to resupply traded resources.