Can someone explain to me whats NBT? I've been surfing on the internet and I'm kinda confused on the articles I come across. Just need a pretty brief explanation of what it is. What I know so far is it is used to store data and is called "Named Binary Tag".
Please stop spamming the threads. This should help you https://forums.pmmp.io/threads/how-do-you-properly-set-nbt.1182/, long story short, you can save any data you want on the item.