If you have projects/plans and would like to manage them specially if you are using agile/scrum methodologies then you can use Office 365 Planner, watch this video
screenshots from Planner:
Extra posts:
Manage Planner tasks assigned to you within Microsoft To-Do 
Manage your team shifts with Microsoft Office 365 StaffHub 
Manage Meetings with your customers using Microsoft Office 365 Bookings 
How to be updated about Office 365 and Microsoft 365 Updates? 
WorkFlows for Office 365 
Microsoft Office 365 Power Apps