Pretty simple and not to long Photoshop tutorial, where you will add a random photo of a person onto a rock and then make it look like it's been engraved.
You have more people using one computer and you don't want them to be able to shut it down using a shutdown button on Windows logon screen, this is how you remove it.
Do you want to buy new mobile phone and you don't know which one? I will show you the way, how to compare phones which will lead to an easier decision.