The best way to familiarize yourself with an inherited codebase

Question

Stacker Nobody asked about the most shocking thing new programmers find as they enter the field.

Very high on the list, is the impact of inheriting a codebase with which

Answer 1

Go over the core libraries and read the function declarations. If it's C/C++, this means only the headers. Document whatever you don't understand.

The last time I did this, one of the comments I inserted was "This class is never used".