what direction does heat flow between objects?

Answer 1

Heat will always flow from hotter to colder. This happens in one of three ways
convection, this is basically the "mixture" of a gas or liquid- like when you pour cold water into hot water to cool it down.
conduction, this is basically two things sitting next to each other, like the way a window feels cold in the wintertime even though it is warm in the house
radiation, transfering energy through electromagnetism like the warmth you feel when you walk outside on a summer day, or when you get close to a radiator without touching it
This is the result of the second law of thermodynamics.

Answer 2

For two objects in contact heat will flow from the warmer to the cooler object until their temps are the same.

Answer 3

From the warmer to the cooler.