A late post today – but since I have no boss, late is OK.
A quick tip for beginners: always make sure your lens is set to allow autofocus! (Set the switch on the side of the lens to “AF”, or “A/M”. If you set it to “M” or “MF”, you are disabling the autofocus system. A very common beginner’s mistake… and all your images are blurry. So, every time you change lenses, ensure you are set to autofocus. And if the camera refuses to focus, check the switch. And on some Nikon cameras, also ensure that the switch on the side of the camera is set to AF-S (usually) or AF-C (action).