How do you quickly explore an unfamiliar C or C++ codebase? We'll use Doom as an example to demonstrate how to navigate an unfamiliar codebase.

Explore the Doom C Codebase in VS Code | Learn to Navigate Complex C and C++ Code on Linux

by Greg Law

From the description:

Using the classic Doom C program on Linux as our real-world example, we trace the exact moment a zombie is killed and backtrack through the codebase to understand how it happened [..] using Undo’s Time Travel Debugging technology.