Well, that's a pretty broad question, especially in this day in age.
Nevertheless, there are many ways.
If you have a Google account, (Gmail) you're already set up to do basic work for whatever suits your fancy online. You can use Google Drive for basic file sharing and word processing, as well as spread sheets, PowerPoint's, etc, etc. There's also this:
https://www.google.com/a/signup/u/0...ang=en&_ga=1.265827848.605203833.1451253239#0
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