In the following 3 Twitter Guides you will learn all you have to know about Twitter and how to use it for business.
For tips and best practices on using Twitter for your small business, download "Twitter for Small Business guide" written by Twitter team.
Other interesting Twitter Guides:
Download "How to Use Twitter for Business - An Introductory Guide" written by HubSpot
Download "The Complete Guide to Twitter" written by Mark O'Neill