Copyright is a type of intellectual property that protects the original works of authors as soon as an author fixes the work in a tangible form of expression. If you are using someone else’s work, please make sure you mention that the work doesn’t belong directly to you. So, when using their work, mentioning the original owner could also help to not be copyrighted by owners.
Here are a few websites that can help you better understand what copyright is:
Fair Use is a legal doctrine that portions of copyrighted materials may be used without permission of the copyright owner provided the use is fair and reasonable. If the materials aren’t being used to be sold by the copywriter or influence the original copywriter then it's fair use. The fair use policy does not allow most of the copyrighted materials to be copied by opposing people.
Here are a few websites that can help you better understand what fair use is: