If I will create a supply chain of for example:
Farm ==> Factory ==> Store
Do I need to have a ware house in the middle. Or will the farm supply the factory directly and the factory supply the store directly?

Does the warehouse has any other strategic aspect in the game?

It is easy to supply your store directly if you have a small operation.  However when you have many farms, factories and stores the picture may look a little different.  Warehouses helps in that it limits the number of relationships that you have to set up in a large network.

Farm 1 >
Farm 2 >                  <—>  Factory 1
Farm 3 >  Warehouse 1   <—>  Factory 2
Farm 4 >                ——>  Store 1
Farm 5 >                ——>  Store 2
Farm 6 >                ——>  Store 3

in this case you only had to set up 13 relationships.  If you has a direct supply chatn farms, factories, stores you would have 18 relationships to set up, and it gets exponentially higher the more units you have

Thank you , Although it is a bit complicated however I believe in 2 days when I have everything set up, I will understand more how the processes go.
Can I store products in my farm, factory and store, or I need to store in a warehouse, and if that is the case and I don’t have a ware house, will the excess products be lost?
Sorry for asking so much that is my first day, I used to play perfectcompetition, and it is a bit different here

It’s not a problem.

All your units can store a limited amount of inventory.  I would suggest that in the beginning while you are still small you can still get away without a warehouse.  If any unit (including the warehouse) is full, it will stop producing (farms), manufacturing (factories), receiving (warehouses) or purchasing (stores) that specific product.

I also used to play perfect competition.  I find that this game is very similar to Capitalism II.  I like the fact that I can now play against other people as opposed to AI

Maybe I’m taking extra steps and doing something wrong, but here’s what would be great about warehouses and factories…especially those you own.  It would be great to find a supplier then be able to add all products to your store or warehouse produced or housed at that facility.  So, if you were working in your warehouse and wanted to add 10 products produced at one large factory, you could find the factory using the normal “find supplier”—then you could bring up a list of everything produced there and click a check box for everything you want to add to your warehouse.  The same thing could be done for your stores, and it would be MUCH easier creating your supply chain.