PDFs are a good file format for sharing work that you want others to be able to print and/or read on just about any device.
From Microsoft Office
The most up to date directions for all versions and platforms can be found on the Microsoft Office help website. What follows are directions for Office for Mac.
Click File > Save As
In the save pop-up, click File Format
Make sure the file has a name and then click Export
From Google Docs
Go to your Google document
Click the File menu
Choose Download as… and then choose PDF Document
The PDF version will download to your computer.