This page gives you some key tips for getting started with the staff portal area. This portal is run through a cloud-based system called G Suite for Education.
G Suite comprises a number of core services - mail, docs, calendar, sites and other tools such as Google Plus, Groups and more. It is a highly flexible and very powerful system.
App downloads for iOS - if you have an android device search for 'Google' in the App Store:
Chrome - Gmail - Drive - Docs - Sheets - Slides - Hangouts - Google+ - more from Google...
This links are for iOS apps, if you use an Android device, check out the Play Store here...