Account & Settings: Often overlooked, “Account & Settings” (top right) allows you to set up what People know about you and how they communicate with you. The default settings are rarely in sync with your needs to network. Defining your own settings is A MUST.
People: All the people who have joined LinkedIn. Clicking on “People” gives you access to “Advanced Search”, the only way to find out who is on your LinkedIn Network. This presentation explains how to efficiently use this “Advanced Search.”
Jobs: LinkedIn Job Portal to find jobs (free) and post jobs (for a fee).
Answers: The best way to get Answers to any Question you may have. But more importantly, the best way to show your expertise on LinkedIn, since your Answers, when selected “Best Answer,” appear on your Profile.
Companies: A great way to find quick information on companies and, more importantly, find People working there.