Teams, SharePoint, Outlook, Yammer - all places for teamwork in Office 365.
GREAT apps for sure but HOW to start with your teamwork in Office 365 ? It's not about what the products can do (they can do a lot :) ) but what you as team can do with the products.
Microsoft is explaining this with the 'Inner Loop' and 'Outer Loop'. I created an infographic for this - take a look!