This is probably the most well known form of plagiarism. When you copy the exact words from another source you must enclose them in the quotation marks and provide a reference.
Even if you do not directly copy the author's words you must provide a reference when you talk about their ideas.
This is a form of plagiarism. Buying, stealing or copying an essay to produce your work is plagiarism. Collaborating with another student (unless requested by your tutor) is also plagiarism.
You can include a table, diagram or image from another source as long as you provide a reference.
Although this may surprise you, self-plagiarism is a form of plagiarism and is not permitted.
It is not plagiarism to copy words from another source as long as you place them in quotation marks and provide a reference.
If a fact is generally well known or 'common knowledge' then you don't need to reference it. Bear in mind that what you consider to be common knowledge may not be well known to others, if in doubt provide a reference.