You could use oil, or butter. I would use margarine because butter is full of fat and some brands of butter are unhealthy.
Unless you have some kind of allergy, you may substitute sunflower margarine for any kind of margarine or butter.
yes you can use margarine, but a better replacement would be lard.
No.
Butter/margarine.
yes if using salted butter do not add salt
butter or margarine.
Yes you can.
Because margarine, like butter has a burn/smoke point. Shortening will not burn/smoke like margarine when the heat hits it.
You can use margarine. In a real pinch, you can use shortening or lard, but like butter and margarine, they need to be "fluffed up" in order to be of a pleasant consistency.
Spread is Margarine. You may also use butter instead.
But yes, in fact if you substitute shortening for butter in the tollhouse cookie recipe they will come out big and stay soft.
Margarine can be used as a substitute for the butter.