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Copying someone else's work word-for-word without attribution is considered direct plagiarism. Proper practice includes using quotation marks and citing the source.

Reusing one's own previously published work without proper citation or acknowledgment is self-plagiarism. Proper practice involves citing your past work as you would any other source.

Every time information from a source is used, proper citation is required to give credit to the original author. Follow the appropriate citation style guide for your work.

Changing just a few words without altering the structure of the original text is insufficient paraphrasing, which can be a form of plagiarism. Proper paraphrasing involves completely rewriting the original idea in your own words.

Unintentional failure to properly quote or cite a source is considered accidental plagiarism. Avoid this by always double-checking citations and using plagiarism checkers.

Using copyrighted material without permission is copyright infringement, which is illegal. Proper practice is obtaining permission, or using material under fair use, and citing it.

Combining information from different sources without proper citation, or changing a few words without giving credit, is known as mosaic plagiarism. Proper practice is to cite all sources and paraphrase correctly.

Common knowledge—facts widely known and undisputed—does not typically require citation. However, when in doubt, it's better to provide a citation to avoid accidental plagiarism.

Ghostwriting is when someone writes content that is officially credited to another person. Ethically, the use of ghostwriters should be disclosed especially in academic and research contexts.