I recently had to take over a few thousand lines of code, spread over 5-10 files. Really, what works for me is following the code from start to finish, and a ve

I recently had to take over a few thousand lines of code, spread over 5-10 files. Really, what works for me is following the code from start to finish, and a very high level. Basically, mapping the order every function is called and getting a quick idea of what that function does. Many times the function name alone is enough. From there, you know where to look when you want to understand some specific functionality in depth.