I've split this into a new topic.
If your post begins with "this is totally irrelevant" then you should already know it should be in a separate topic.
The manual goes into depth about everything that is specific to Opus. But the manual is not aiming to teach you how to program in general. There are hundreds of guides to that already on the web.
There's also some earlier discussion here:
(There maybe some other forum threads with links as well but I am not sure. Found that one from a quick search.)