What I find more useful than anything else is to find the entrypoint to the code you’re interested in, set a breakpoint on the first line, and step through with

What I find more useful than anything else is to find the entrypoint to the code you’re interested in, set a breakpoint on the first line, and step through with a debugger. IMO it’s by far the fastest way to understand how an application bootstraps itself and produces its output.