Intellectual property (ideas, writing, speech, and art belonging to an individual) is no different than physical property. If you bought a new car, and someone stole it for their own use, you'd be upset -- that's a crime. The same principle applies to property generated by someone's mind. It belongs to the creator and ownership of it should be respected. Intellectual theft is a crime, and there are consequences for committing it.
We are encouraged to use brilliant and important ideas created and published by others, but we MUST give credit to the minds who generated them. So correctly documenting borrowed ideas, images, and text is the only respectful way to honor the intellectual ownership.
Below are some tools to help you honor the work of other thinkers and creators.