How do I cite a source with no author in Chicago style?

In a Chicago footnote citation, when the author of a source is unknown (as is often the case with websites), start the citation with the title in a full note. In short notes and bibliography entries, list the organization that published it as the author.

Full note1. “An Introduction to Research Methods,” Scribbr, accessed June 11, 2020,
Short note2. Scribbr, “Research Methods.”
BibliographyScribbr. “An Introduction to Research Methods.” Accessed June 11, 2020.

In Chicago author-date style, treat the organization as author in your in-text citations and reference list.