What are the 3 “key ranking factors” that Google uses in their algorithm?

Google's core algorithm prioritizes Authority, Usefulness, and Relevancy to determine search rankings. Authority refers to the trustworthiness and expertise of a website, often measured by backlinks from reputable sources and overall site reputation. Usefulness assesses how well content answers a user's query and provides value, considering factors like comprehensiveness and clarity. Relevancy determines how closely the content matches the user's search intent and keywords. While CSS and loading speed are important for user experience and can indirectly influence rankings, they are considered technical or user experience factors rather than the foundational "key ranking factors" that define the core quality and intent matching of a page.