There are 3 ways to use sources: quote, paraphrase, summarize. In paraphrasing you need to change all the original words or phrases to avoid plagiarism. In all cases you need to properly cite the source.
There are 3 techniques to use sources: introduce it, cite it, list of references.
There are 2 ways of citing: in-text, end notes/footnotes.
There are 2 types of plagiarism: ghost writing, copy & paste
You may test your knowledge of plagiarism in this excellent quiz created by the Indiana University.