About gall stones

I am very confused about how fats are best eaten to maximize nutrional
value and minimize toxicity.
I understand deep fried foods are really bad - is food that is fried
so that the oil is not allowed to reach smoking point bad too…what
happens at smoking point - a chemical reaction?
How should fats be eaten - alone - olive oil by itself (and yet
flaxseed oil should be eaten with cottage cheese?)
Is sauteeing ok? Is it ok to heat oil at all?
I am just confused…I am concerned because I want to stop producing
gallstones…and I understand they are made of bad fats.
I would be very thankful if you could point me to any sources.
Julian