you got already 5 times more training than I ever had.
And honestly after 15-20 days training you should have understood those basics
Or do I understand this wrong and you have the opinion that you get 15-20 days to train yourself with the help of SCN? SCN is not meant to replace SAP trainings.
In SCN users help users, but you have to take some effort yourself to get you up to speed, especially when the information is already available in any of the SAP sites then this should be your first source instead of asking questions to get finally the same information.