My usual use cases for Office 365 include basic use for receiving or sending emails for official purposes using Outlook, and for creating small documents in Excel or Word. I use Word for PowerPoint presentations and any type of documentation to provide to clients.
Regarding Office 365 features and capabilities, I honestly don't use too much of the features of Outlook or Excel because I'm a technical person regarding my tools. I'm only using it for mail purposes or other documentation.
I use Microsoft Teams as a tool for communication and collaboration. Microsoft Teams is a very good option for me to connect within the organization or with my team. We can also connect with external teams, share links, share screens, and take control of other people's meetings. We do a lot of things through Teams, and we have scheduled many meetings with the help of the Teams calendar.