Broadleaf Commerce Discussion Forums

I have visited the docs section of the broadleaf commerce, but I couldn't find that tutorial helpful. I would like to have the description of the classes given in the broadleaf commerce, what a method is a for, what a class is for and where to start instead of editing the demo-site.

I would like to know the concepts in the broadleaf commerce, where to start, the order I'll need to get on learning the broadleaf commerce step-by-step.

Thanks in advance.