From the perspective of black hole thermodynamics, this exposition
provides the physical and mathematical account of thermodynamic
geometries, higher derivative corrections, N= 1, 2, 4 configurations,
Calabi-Yau compactification, string theory and M-theory. We illustrate
the local and global statistical stabilities and phase transitions for
an ensemble of Kerr black holes in general relativity, and thereby
consider a class of macroscopic attractors, including (non)BPS black
holes, (non)extremal black holes, and (non)supersymmetric black holes in
supergravity theories. For a given black brane ensemble, we shed light
on the limiting thermodynamic fluctuations and higher order effects by
considering Sen entropy function method as a generalized attractor and
its quantum counterparts via the AdS/CFT correspondence. This research
gives string (field) theory and M-theory fundamentals for the
state-space, chemical, Legendre transformed and short distance (quasi)
geometries. From the perspective of black hole thermodynamics,
(un)attractors and an ensemble of microscopic vacua, we discuss the
(in)stability of black brane configurations in conformal field theory,
string theory and M-theory.