When are objects created and when are they destroyed?
How does temporary lifetime extension come into play and what changed there recently?
What happens when you `std::malloc` memory and just pretend objects are there without creating anything?
Or worse: You use `mmap()` to read shared memory.
How do unions interact with constructors, strict aliasing, or the "common initial sequence"?
What when you explicitly call the destructor and later re-use the same storage?
What's the deal with `std::launder`, `std::bit_cast`, and `std::start_lifetime_as`?

We'll answer all of those questions and much more.
We'll do that by looking at the C++ standard, old and new proposals, and compiler optimizations.