[1.11.2] Generate loot in chests

[Villfuk02]

I'd like to make my items generate in dungeon chests, but i don't know how.
I probably need to somehow extend loot tables, but how?

thanks for any help

[Villfuk02]

and how exatly do i modify it - do i subscribe some event, that generates the chests and do something with it there?
 

[Villfuk02]

Am i suposed to create method like this?
 

@SubscribeEvent
	public void modifyLootTables(LootTableLoadEvent evt){
		evt.SOMETHING;
	}

if yes, what should i do wit the event?
 

[Villfuk02]

so far i understand it like this:
i make some LootTables, which consist of LootPools etc...

that's simple
BUT how do i tell it to use the default loottable + my loottable when it generates the chests? 

[Villfuk02]

and what if there is another mod, which alters the loottable, will be all the changes to the loottable registered?

if not, then how do they do it, because i've seen many times drops from multiple mods in one chest