Tapping is like clicking with a mouse. Just tap an app to open it. To select text within an app, tap it and then use the handles to adjust the selection.
Press & Hold
Holding your finger on an object can do one of two things, depending on the app:
Slide your finger across the screen to drag objects, or to scroll the screen.
Swipe from the Right-Hand Edge
Swipe from the right side of the screen to view the Action Centre.
Swipe from Top to Side
Swipe from the top of the screen to the side of the screen to allow you to use two apps side-by-side.
Pinch & Zoom
Some apps, such as maps and photos, support pinching to zoom in and out.
Some apps may also allow using two fingers to rotate objects on the screen.