Help with Event Graph

I’d like to make it that when my custom ammo is consumed, it adds one of that ammo to my inventory. However, I’ve never worked in the event graph because I can’t find any information on how that system works specifically in the Ark dev kit. What do I need to do?

you don’t need the event graph for this. In your primalitem blueprint you find a entry thats called give additional item by consume.
Here you insert the ammo and you become the ammo by using that item.