Since I've only been baking bread for about 6 months, I rely on a lot answers from veteran bakers and some excellent websites, DC being one of them. While trying to find the cause of a problem for a friend recently, I came across a troubleshooting guide to answer questions to some common problems. It also gives good information about ingredients, structure and baking of bread. The troubleshooting guide is at the bottom of the page.
Check it out and see if this helps answer questions that I don't have answers for. Of course, we can always rely on the many veteral professional and amateur bakers here on DC.