It’s ok to quote people on your blog or website, but it is against the law to cut and paste large blocks of copy and other content. Try to quote not more than 10% of the material. Make your point, honor the original material, by listing your source and get back to your own writing. If you take photos from another source, make sure you have the right to do so. If the photo credit is listed, contact the photographer before you just post it on your blog or website.