There is, as I am sure you have discovered, quite extensive information in the
Help Files.
Here is another good source that may be of help...
http://mainsequencesoftware.com/content/SGP-The%20First%20Week.pdf
This is a PDF file that you can download and work with at your own pace. It
has been around a while so unsure if it is totally up to date.....but for
sure it should be a help for a beginner with SGP.
Brendan.