Energy is defined as the ability to perform work, which it is a somewhat unsatisfactory definition, I would say. Indeed we must admit we still do not understand deeply what energy really is, but we can already list some of their characteristics. This is a basic summary of what is known about energy.
Energy is an entity that we know only some of its properties. From what we know so far, its total is constant, can not be created nor destroyed, only transformed from one type into another. Maybe the universe has already born with a constant amount of energy. From what we know so far, this quantity does not increase or diminish with time. The initial amount of energy was suffering successive divisions, forming all the elements known, and even the unknown by humanity. Thus, each atom, each particle represents a fraction of the initial fixed amount of energy of the universe.
I re-address this issue in detail later, but I can say is that time and space are intimately related to the concept of energy. The space is created for the distribution of energy, and time, the variation on this distribution. As I said, this desearves be studied further in future posts. One question that remains open is: where did the energy comes from? What or who created it? I am inclined to say that the energy comes from God, and therefore shares some of its characteristics.
Among the forms of energy, we have the heat, the gravitational, the electromagnetic, etc.. The mass of a body can be considered as a kind of concentrated energy, because of relativity of Einstein we know that mass is equivalent to energy, by the formula below;

Once the energy has a variety of types, as many as are the types of force. The concept of force is closely linked to energy. Force can be defined as of energy transfer rate between bodies.
I must stress that as far I know, from all theories about the origin of the universe, absolutely NO ONE explains the origin of the energy! Please correct me if I'm wrong! The Big Bang explains how the space and time and everything else was created from a highly concentrated energy, but does not explain the source of energy in itself!
A crucial point that stands out is that energy seems to be the link between the kinds of systems, and could not fail to be, it is also essential for life.
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