  This thesis is entirely devoted to black hole physics as a natural arena to
study quantum gravity related questions. The five main Chapters present the
results already published in arXiv:1512.04566 [gr-qc], arXiv:1604.07222
[gr-qc], arXiv:1707.00479 [gr-qc], arXiv:1807.02041 [gr-qc], arXiv:1811.03667
[gr-qc]. A main introductory Section, together with the Sections introducing
each of the two parts of the manuscript compose the \emph{fil rouge} of the
thesis, and are not published elsewhere. They contain reviews (together with my
personal view) on the information paradox (Part 1) and the thermodynamics of
spacetime (Part 2).
