Google has approx 200 ranking signals. They rarely disclose which is the ranking signal and which is not. Most of Google’s rank algorithm is shrouded in mystery.
Google announced that RankBrain, their artificial intelligence system, was one of the top three ranking signals.
During a Q&A session Andrey Lipattsev, a Search Quality Senior Strategist at Google, named the two other top signals in response to a question by Ammon Johns.
Yes, links and content are those 2 signals
So according to Google, the top three ranking factors are
Andrey also stated there was “no order” when asked for clarification on the order of importance.
You can watch the full Q&A session below. The discussion about ranking signals begins around the 30-minute mark.