To use any of the Google Workspace Apps on your mobile device, just search your App Store for Gmail, Google Drive, etc.
The first time you start the app, you will be asked to login with your SHC Google credentials. Be sure to use your full email address as your user name.
Here are links to two of the most popular apps to get you started.
iOS: https://apps.apple.com/us/app/gmail-email-by-google/id422689480
Android: https://play.google.com/store/apps/details?id=com.google.android.gm
iOS: https://apps.apple.com/us/app/google-drive/id507874739
Android: https://play.google.com/store/apps/details?id=com.google.android.apps.docs
To use Google Workspace Apps on your laptop or desktop, just open a browser and navigate to the Google homepage. Click the Sign In link and log in with your SHC Google credentials. Be sure to use your full email address as your user name.
You can now use the Applications icon (9 squares in the upper right) to navigate to all of the SHC Google Workspace Apps.