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Clicking and dragging your mouse to select some text works, but it’s not very efficient. If you’d like to select a single word in a document, double-click on that word. If you’d like to select the whole paragraph, triple-click anywhere in the paragraph. Go ahead, try it here.
When you’re giving a presentation sometimes you want the audience to pay attention to you instead of your slides. In these cases remember these two keys: ‘b’ & ‘w’. The b key turns the screen black, while the w key turns the screen white. To return to the slides, just tap the relevant key again. (I think this works in Keynote too. Please feel free to confirm/deny in the comments.)