Tap: To tap is to touch. Just touch your phone once. Tap will help you do a lot of things. You can tap to open a link or dial a number. You can tap to interact with a submit or login button. Most buttons and keyboards ract to taps. You tap to type. Some phones have multi touch enabled and you can tap two or three buttons at the same time. This allows you to play games on your phone effectively.
Double Tap: Certain applications allow you to double tap. If you double tap on a browser, you will zoom in or out. You need to double tap on certain applications to interact with certain buttons. Photographs too respond to double tap. When you double tap, photographs zooms in or out.
Long Press: You can press for a long time on the screen when you are interacting with an Application. Long press usually brings up a menu. This menu usually contains copy, cut and paste functions. You can long press on certain applications to select all text. In a browser, you can long press to open a link in another tab or a new window.
Pinch or Spread: With two of your fingers you can imitate the action of pinching to zoom in or out. If you pinch in, it zooms out. If you pinch out or spread, it zooms in. You can pinch pages or photographs to zoom them in or out.
Swipe: Android allows you to swipe horizontally or vertically on the screen to interact. Usually, you swipe to unlock the phone. You can also swipe to move things around. You can swipe on certain applications to go from one page to another.
Flick: Flick is like you flick a page in a book. It is a short swipe. When you swipe you move your finger from one end of the screen to other. When you flick, you swipe for a short period. You can flick on the screen usually to move from one page to another.