How to get your Mac to read text out loud to you

If you're having trouble reading what's on your Mac's screen, here's how to get Siri to audibly read out what's on screen to you.
While monitors are the primary way for people to get information from their Mac, not everyone has that luxury. For those who are visually impaired, they cannot rely on what is shown on the screen as a source of information, and so require alternative methods.Apple has a solution to this, buried in its Accessibility settings, titled Spoken Content. The feature effectively allows you to set macOS to use Siri to read out text that appears onscreen.