If you are using Office 365 on a mobile device there are a few apps you should make sure you have on your phone or tablet:

• Office - Contains Word, Excel, and PowerPoint, and more. 
• OneDrive - Easy Access to your files on Office 365.
• Teams - Collaboration and Communication.
• OneNote - Take notes easily and use Class NoteBook.

We also recommend that you download

• SharePoint - Easy Access to all resources on Office 365 and better resolution when using this page!
• Office Lens - Scan documents or even a whiteboard, directly to OneNote and OneDrive.

All apps above are available both for Apple iOS and Android, including on Chromebook!