Help with sub-tables in module script

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#1

I’m following an Alvinblox tutorial since I’m a beginner at coding, but I do know quite a lot about coding fundamentals so I’ll try to explain this as well as I can.

I have a module script called “petModule” and I cant figure out how to get the items inside of subtables(is that what they’re called?) and I need to in order to return the rarity of the pet, but I just don’t know how.
The pet returning does it somehow(actually it only does it on the simple rarity, everything else returns nil) but I need a new function to return a different part of the table, the pet rarity.
Don’t know if that makes sense but I’ll just put the module here

local petModule = {}
local petFolder = game.ReplicatedStorage.Pets
petModule.pets = {
	
	[(rarity)] = {
		petFolder[(pet)]; -- (pet) is just what I'm putting here, not the actual code --
	} ;
	
	[(rarity)] = {
		petFolder[(pet);
	} ;
	
	[(rarity)] = {
		petFolder[(pet)];
	} ;
	
	[(rarity)] = {
		petFolder[(pet)];
		petFolder[(pet)];
		petFolder[(pet)];
	} ;

	[(rarity)] = {
		petFolder[(pet)];
		petFolder[(pet)];
	} ;
}

petModule.rarities = {
	[(rarity)" = 5; -- ditto --
	
	[(rarity)] = 5;
	
	[(rarity)] = 10;
	
	[(rarity)] = 25;
	
	[(rarity)] = 55;
}

petModule.ChooseRandomPet = function()
	local randomNumber = math.random(1,100)
	for rarity, weight in pairs(petModule.rarities) do
		local count = 0
		count = count + weight
		if randomNumber <= count then
			local rarityTable = petModule.pets[rarity]
			local chosenPet = rarityTable[math.random(1,#rarityTable)]
			return chosenPet
		end
	end
end
petModule.GetRarity = function()
	local rarity = petModule.pets.
	return rarity
	--what I tried, but then I found out why this wouldnt work--
end
return petModule

thanks! I might not be able to reply for a while.

edit: the other half of the text is red, weird