There are two ways to take a screen shot on your Samsung Galaxy phone. This video shows the process on a Samsung Galaxy S3, but will work similarly on other Galaxy phones. To take a screen shot on a Motorola Droid: Press and hold Sleep/Wake button and Volume Down button at the same time.
You cannot set a home page for your Safari browser on your iPad like you can on the browser on your computer. There is a work-around that you can use to open the browser to a web page you select. This video shows the process in iOS 7.0. It is shown using the iPhone, but works the same on iPad.
There may be times when you need to force an application to close. Pressing the Home Button to return to the Home Screen doesn't actually close the app, it just hides the app from view. If an app is unresponsive or running slow you may want to close it completely.