Harokopion University of Athens, in collaboration with Google, provides a variety of services for its users through Google Workspace for Education. The suite provides dozens of services but the most basic and well-known ones are divided into those for interface, creation and access.
With your academic account (@hua.gr) you can use apps like Gmail for email, Calendar for scheduling tasks and Meet for video conferencing. Furthermore, there are available applications like Docs for texts, Sheets for spreadsheets, Forms for creating questionnaires, Slides for presentations and Sites for creating web pages in your Drive environment.
For more information about using the above services, you can use Google Support.