I just checked out chromium's source, but I desperately need to learn how to navigate around this monster.

How would I search for parts of the code that implement behavior/features I'm interested in?

Let's say I want to see what happens after a URL is entered into the address bar. How do I find that piece of code?

Or, that I want to see what happens when, while parsing HTML, a certain tag is reached.

I have before me a huge amount of source code, and no skill of navigating around it. How do I learn that skill?