Greek speakers, can you explain Greeklish to me?

If you are using Windows, go to "Control Panel," click on "region and language," then on "keyboards and languages," and choose "Greek". Then type out all characters in order so you can learn which Latin alphabet letter on your keyboard will type which Greek (not Greekish, please!) letter. You will now have a Greek keyboard! A "GK" should now appear in the bottom right hand corner of your screen, and you click on that any time to which to change back: you will then be offered EN to click on to return to a UK or US keyboard.