Hey, I want an inventory system in which you can combine, examine and drop items on the floor & I also want some items to be stackable. I can’t find a tutorial on youtube with all of those things so any links or ideas or anything will be really appreciated. Thanks!
*I would build the system from scratch and I barely know about programming lol
There are a large variety of inventory systems on the UE4 marketplace. And searching youtube for “ue4 inventory system” came back with a lot of relevant things.
I doubt you’ll ever find a thing EXACTLY what you need with every feature, but there are tons of resources to help get you started. And some of them I do know offer those types of things.
As has been said, it is unlikely you will find a tutorial which covers exactly what you are after, however there are a number of tutorials out there that cover those different things. Basically, I started off with an inventory tutorial which had basic features, and once I understood it correctly, I was able to build upon it to include what you want to do and much more.
Try one tutorial, and once you start understanding what is going on, you’ll be able to turn it into whatever you want. If I can give you a starting point which is what I used, I would suggest the below: It is well done, and easy to build upon once you get the hang of it.
Inventory System by Ryan Laley
The inventory System by UnrealGaimeDev is the most complete I am aware of. It is also a tutorial that I am currently following, and I happen to be a little stuck, so if a kind soul is willing to help, it would be much appreciated 
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Have you considered using the UE4 Gameplay ability system? They provide a sample project showing how it is best used. It provides an inventory system and other things.
Thanks to everyone!!! I’m sorry to be this late, but I jumped into other stuff and I eventually forgot about this… I’ll let you all know if I was able to do what I wanted in August, thanks again!