A cloud called OneDrive, that allows you to create or edit documents no matter what device you are on. I own a Windows 10 PC, MacBook Air, and an iPhone. I can edit the same Office 365 document on all of these. Cell phone mode makes your document easier to read on the smaller smartphone screen.
Teams can collaborate on documents since they are on the OneDrive cloud.
Spell Check in Word: When you right-click (or command click on a Mac) on a red underlined word, you get a list of definitions of the different words being suggested.
Excel has a Tables feature that allow you to uniquely name each table (formerly called lists) within your document. Formulas are easier to create because you can refer to a table and field (column of the table). When you create a formula, Excel will prompt you, by showing you a list of Table names.
In Tables you can also turn a totals row off and in. Add new information to a row at the bottom of a table and then turn the total row below that on. (You can still insert a new row anywhere in your table).
If you add a new column to a table, for example with the column header named cost and then enter your formula in the cell below that (price x quantity), Excel will flash fill that formula all the way down to the last row in your table.