Under the Learn the Basics Section:
Under Optimize Your Activity:
Under Start Advertising:
Some of the more useful sections are the Twitter Best Practices guide with detailed info on how an individual or business should best utilize Twitter. If you are interested in seeing how others are using Twitter check out the Case Studies section.
In the Start Advertising the various methods are explained.
“When you promote a Tweet, only the most relevant users see. Promoted Tweets are offered on a Cost-per-Engagement (CPE) basis, so you only pay when a user Retweets, replies to, clicks on or favorites your Promoted Tweet. ”
“Promoted Trends is the exclusive opportunity to feature a Trend related to your business at the top of this Trends list. When a user clicks on the Trend, they are taken to the conversation for that trend – with your Promoted Tweets pegged to the top of the timeline”
“Part of Who to follow, Twitter’s account recommendation engine, Promoted Accounts highlight your account to users most likely to find it interesting. Twitter looks at your account and followers to identify similar accounts and similar followers, for amazing accuracy.”