You probably know that a correlation is the relationship between two sets of variables used to describe or predict information. Therefore, the correlation coefficient is the degree in which the change in a set of variables is related.
Delta G is a measure of the net effect of these two concepts, and will help you predict whether or not a reaction will actually take place! Delta G naught refers to the Delta G if you were creating a given compound from its pure elemental form at standard temperature and pressure. So it's how likely a compound would form from its individual elemental components!
DGo (a delta G, with a superscript o), is the free energy change for a reaction, with everything in the standard states (gases at 1 bar, and solutions at 1 M concentration), and at a specific temperature (usually 25Â°C)