On your device you will need to download the Google Classroom App. This is normally via the Apple App Store or on Android Google Play. It is also advisable to have the complete set of Google Apps downloaded as these may help when editing your Google Classroom files and any work assigned. These include: Google Docs, Sheets, Slides. Also so that you can access your stored files, Google Drive is recommended. Google Drive for education is an unlimited storage space so you won't have to worry about filling up your devices memory storage space with all that hard work.