I’ve got some quick shortcuts for selecting text in Word that you’ll want to try out. You can always left-click with the mouse and drag to choose the selection. However, that can sometimes be a tricky operation on a touchpad.
To select a single word in a jiffy, double-click on the first letter.
To select a sentence, press CTRL and click on any word in the sentence.
To select the whole paragraph, just triple-click on any word in the paragraph.