I've never used spreadsheets for anything more than a quick graph. I'd like to learn how to use spreadsheets to their full extent and have been playing around on Google Spreadsheets.
There do not seem to be any thorough tutorials on Google Spreadsheets and even Google's documentation often makes references to Excel functionality without explaining it.
My question is, should I first learn to use spreadsheets on Excel and then move to Google spreadsheets? I'm not doing anything extraordinarily complicated, but I'd like to have a clearer understanding of this "spreadsheet programming" if I may express myself so.