Use double quotation marks for the main quote.
Use single quotation marks for a quote inside a quote.
Example: “She said, ‘I am leaving now.’”
If the inner quote is part of a quoted passage, keep the punctuation inside the quotation marks when required by the original text.
For a quote within a quote in APA, preserve the original wording exactly.
If you are quoting a source that already contains a quotation, reproduce the nested quotation marks as they appear in the source.
If you are paraphrasing instead of quoting directly, no quotation marks are needed.