Many photos online are protected by copyright. I try to use my own images when I can or get an image from a site I know are free for anyone to use like www.publicdomainpictures.net. In some cases it is okay to use the image if you include the link to the site it came from so the owner is credited for it. Also many of your Facebook friends will be delighted to let you use one of their personal pictures provided you ask them, of course. Stay clear of any images with embedded water marks. This is a no no and I've had to take pictures down from some of my own hubs after realizing I couldn't use them. The learning center here is excellent, but with tons of things to learn, I tend to forget much of it and find myself returning to the tutorials or learning as I go through trail and error. Other hubbers here are very eager to answer questions the best they know how and you'll find them helpful.