Outline
(Title + 1 slide, ~115 kB).

1. Basics of General Relativity
(17 slides, ~1.0 MB).

2. Boundaries, Shells and Junction Conditions
(11 slides, ~675 kB).

3. Basics of Causal Structure and Penrose Diagrams
(13 slides, ~736 kB).

4. Shell Effective Dynamics and Possible Applications
(9 slides, ~458 kB).

5. Some Concrete Cases: from Vacuum Decay to Charge and Mass of Bound States
(12 slides, ~614 kB).