I cannot express how many times I’ve needed to step through the MFC source code in order to debug a problem I was having.  Often, the problem ends up being my own issue, but by stepping through the MFC source code, I was able to get a better understanding of what exactly the issue is.

So today’s tip:  make sure you install the MFC source code when you’re installing Visual Studio.  It’s an optional component, so best to do a custom install to ensure it’s selected.