So "To" is for people who are actively involved, "CC" is for people who are passively involved, and "BCC" is for when you want to mass mail but protect e-mail addresses. So, this is all new to me. Are there any more basics that you can think of that you think would be important to know?
Not mentioned in all this is that cc originally stood for "carbon copy" and bcc for "blind carbon copy." If you think of life like an episode of Mad Men you'll grasp the original intent. As others have mentioned, you are more likely to wrap yourself around the wheel than save yourself effort with bcc. It's like the floor polisher of online communication: devilishly simple in design, effortless in observation and the quickest way to break a limb and destroy the office when wielded by the untrained.