Like my last post this is a ditto of something I posted on Reddit, but you guys are probably more familiar with Amplitude so I'll put it here as well

molsonite wrote:

If it works any way similar to Endless Space 2, then there will be a small number of key strategic resources required to build/update special units/buildings/ and to update/improve Hero units. I'm not sure that Hero units have been discussed yet. 

Best guesses are 

Copper - very early game which is then is then replaced by Iron. 

Lumber is another likely resources. 

Grain or Corn perhaps. Although it's likely there's a simple food mechanic for this. 

later on 

Coal

Oil

Steel (some combo of Coal/Iron ??).

Without these resources you are limited in what you can build and what you can update. 

Luxury resources can provide currency at the MarketPlace or whatever equilavent we are getting for HumanKind. Also, certain Luxury can provide certain

boosts to each culture. Wine for instance might provide a boost in citizen happiness and a boost in Civics. 

Gold might product increased money generation and allow for coinage which further increases trade and culture prestige. 

There are usually like a dozen or more of them. Collecting 100 diamonds for instance be a goal that helps generate the fame points needed to 

advance. 

Hmmm, thank you for your answer, could I ask you a few question?

1. What is the marketplace?

2. does your example of 100 diamonds come from something from the endless games?

thank you in advance

In most Endless titles the marketplace was a window that allows you to sell and buy luxuries and strategic ressources for a price that is "mostly" defined by the quantities all players supply the market with.

In Endless Space 2 there's a economy screen that you can bring up. It contains a marketplace where 

you can buy and sell strategic goods

and 

luxury goods. 

Also, you can spend luxury goods to create the ability to uplift territories a level. Each level increase came with a bonus specific to the luxury item used. Providing +30 Food in system for instance or +30 Happiness/Morale. Not sure this level mechanic will be part of HumanKind with the advancement of eras. In Endless Legend, you could "spend" luxury goods to get certain bonuses for a number of turns. Each luxury was mapped to a specific production type ; Food/Industry/Dust (the gold of the Endless series of games)/Science/Infuence, and would provide a bonus towards it like 20% increase in Industry for 20 turns. 

In Endless Legend, you could also create or purchase Stored Food/Science/Industry. 

I imagine the mechanics will be similar trade is such a huge piece of Humankind development.