You can use a variety of techniques to select text that you want to work with.
To select letters and other characters, click in front of the first character and then drag across the characters you want to select.
To select a word, double‑click it.
To select all of the text in a provision or other item that you’re working with, press Command‑A. To expand this selection, press Command‑A again.
To select a range of text, click the start of the range, and then click the end of the range while holding down the Shift key.
To extend the selection one character at a time, press Shift–Left Arrow or Shift–Right Arrow.
To extend the selection one line at a time, press Shift–Up Arrow or Shift–Down Arrow.