could someone help me here ? i did inves in corn but didnt get the knowledge

Можно получить по цепочке квестов, которую начинает Игорь Бартелли в Велии. Первый квест [Сбор. Начало производства]. В процессе выполнения этой цепочки кузнец Велии Транан Андерфо даст квест [4. Связывание узлов], наградой за который будет знание "Производственный узел".

:Start:
//Igor Bartalli
Start of Productions
-Completion Requisites
Talk to Tool Vendor Zaaira

:Continuation Quest:
//Zaaira
A Wealth-Bringing Production
-Completion Requisites
Collect 3 Corn from the corn field
Talk to Blacksmith Tranon Underfoe the patient blacksmith

:Continuation Quest:
//Tranon Underfoe
Connecting Nodes
-Completion Requisites
Talk to Severo Loggia

:Title Completion after talking to Severo Loggia:
Congratulations!

It took me ages to find out how to get this knowledge because the guide from this other comment is completely useless . Here are the steps that are necessary:

* Go to Bahar, the Trade Manager of Velia ( https://bdocodex.com/ru/npc/40010/ )
* Accept the quest "[Trading] Preparation for Trading" ( https://bdocodex.com/ru/quest/1051/1/ ) from him. This quest may auto-complete for you.
* Buy one piece of "Velian Wine" from him! This is where I got confused, because you have no active quest, and yet you need to buy that Velian Wine from him and then suddenly a new quest will be available.
* After you have bought the item from him a new quest will be available which is called "[Trading] Trading Activity" ( https://bdocodex.com/ru/quest/1051/2/ ).
* Follow this questline til the end and follow its instructions. You will have to invest in the nodes "Loggia Farm", "Imp Camp", and "Western Guard Camp" in the process.

* You will be at the NPC Luke at Western Guard Camp after doing those quests and he will have a new quest for you called "[Trading] How to Make Trade Items?" ( https://bdocodex.com/ru/quest/1051/6/ ). This quest will send you to the NPC Severo Loggia at Loggia Farm.
* Severo Loggia now has the quest "[Trading] Understanding Production Nodes" for you. Once you accept it you can talk to him again and ask him "What is Node Production?". This will give you the knowledge and finish the quest at the same time.