  This paper represents an elaboration of the lectures delivered by one of us
(CAF) during "Course 197 -- Foundations of Quantum Physics" at the
International School of Physics "Enrico Fermi" in Varenna, Italy, July 2016.
Much of the material for it is drawn from arXiv:1003.5209, arXiv:1401.7254, and
arXiv:1405.2390. However there are substantial additions of original material
in Sections 4, 7, 8 and 9, along with clarifications and expansions of the
older content throughout. Topics include the meaning of subjective probability;
no-cloning, teleportation, and quantum tomography from the subjectivist
Bayesian perspective; the message QBism receives from Bell inequality
violations (namely, that nature is creative); the import of symmetric
informationally complete (SIC) quantum measurements for the technical side of
QBism; quantum cosmology QBist-style; and a potential meaning for the
holographic principle within QBism.
