ones solid and ones liquid
gctf
yes you can use margarine, but a better replacement would be lard.
No.
Butter/margarine.
yes if using salted butter do not add salt
No. Margarine contains oil from canola, sunflower or corn. Margarine is not based on animal fat from milk; butter is.
You could use oil, or butter. I would use margarine because butter is full of fat and some brands of butter are unhealthy.
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.