It was last year when Google confirmed that RankBrain was one of the three most important signals. Recently, Google’s Search Quality Senior Strategist Andrey Lipattsev in a live Q&A session with Ammon Johns, revealed that Links and Content are the two other important ranking factors.
When Ammon asked about the other two factors, Andrey straight away said, “It’s content and links pointing to your site”. But not necessarily in this order. There is no order actually. All SEO’s have know for long now that content and links are important and Andrey’s revelation doesn’t really affect the strategies.