1.Tweet: A 140character message.
2. Retweet (RT): Resharing or giving credit to someone else's tweet.
3. Feed: The stream of tweets you see on your homepage. It's comprised of updates from users you follow.
4. Handle: Your username.
5. Mention (@): A way to reference another user by his username in a tweet (e.g.@mashable). Users are notified when @mentioned. It's a way to conduct discussions with other users in a public realm.
6. Direct Message (DM): A private, 140character message between two people. You can decide whether to accept a Direct Message from any Twitter user, or only from users you are following. You may only DM a user who follows you.
7. Hashtag (#): A way to denote a topic of conversation or participate in a larger linked discussion (e.g. #AmericanIdol, #Obama). A hashtag is a discovery tool that allows others to find your tweets, based on topics. You can also click on a hashtag to see all the tweets that mention it in real time — even from people you don't follow.
8.Twitter Lists: Lists you create to segment your followers to share publicly or privately. Very easy to do: Read this:https://media.twitter.com/bestpractice/ createandusetwitterlists
9. Live Tweeting: commenting on an event live on Twitter with a hashtag. It’s important to let people know you’ll be live tweeting so they are aware of the tweets you’ll be posting.