The Home Button and Home Screen
The home screen of the iPhone is like the Start menu of Windows or an expanded dock bar on a Mac. It contains all of the “apps" on your phone.
You can navigate the pages of the home screen by swiping to the left or right. The left most pane is a universal search for the phone with links to Google and Wikipedia. This universal search indexes and searches through apps, contacts, email and SMS text messages, and calendar appointments.
Apps can be organized into folders, which can be helpful for grouping similar apps to de-clutter your home screen. Apps can also be rearranged by clicking and holding on the home screen until they begin to wiggle. Once wiggling, you can drag and drop them as you please. Apps you use most frequently can be placed in the dock along the bottom. These will always be visible no matter what page you are on. My dock consists of the Phone, Messaging, Email, and Browser because these are the things I access most.
The Home Button is your lifeline to the phone. If you are ever lost or stuck, simply hit this button once to return the home screen. Tap it twice and it brings up your currently opened apps. To fully close one, simple tap and hold on it until the red close symbol appears and click it.
As mentioned, all of your apps are contained on the home screen. This includes apps for checking email, your calendar, contacts, phone dialer, YouTube, maps, and everything else you download. To add or install more apps, simply load up the App Store (purple icon) or use iTunes on your computer and search for what you’re looking for.
Multitasking on the iPhone is accomplished through the home button. Again, double tap it to see what is currently running. You can scroll through the list (left and right) and select any active app to switch to it. If you scroll all the way to the left, you will find your iPod media player (or another music player like Pandora if you have it opened). This provides easy control to your music from any other application.