Drag to select one or more characters.
Click in the text, and then Shift-click to select a range of characters.
Choose Select > All to select all the characters in the layer.
Double-click a word to select it. Triple-click a line to select it. Quadruple-click a paragraph to select it. Quintuple-click anywhere in the text flow to select all characters in a bounding box.
To use the arrow keys to select characters, click in the text, and then hold down Shift and press the Right Arrow or Left Arrow key. To use the keys to select words, hold down Shift+Ctrl (Windows) or Shift+Command (Mac OS) and press the Right Arrow or Left Arrow key.