Welcome.
Think of it as a library.If you want info on something you try the appropriate section. If you really get stuck try chatterbank. Most people on here are really helpful and will try to guide you.
I struggled a bit at first but would not be without it now.
Good luck.
Also, assuming that you're 'genuine' (or even if you're not), a useful hint is that clicking on the word 'Topics' (at the top left of the screen) displays a complete list of all AB's sections and sub-sections.