What are the Google ranking factors?

google ranking factors -

Google uses over 200 ranking factors in its algorithm.
All factors can be divided into the following sections:
Domain Factors
Page-Level Factors
Site-Level Factors
Backlink Factors
User Interaction
Special Google Algorithm Rules
Brand Signals
On-Site Webspam Factors
Off-Site Webspam Factors/
Only comprehensive SEO site optimization will help you in this task.

and which ones are the most important?

tazarbm said:

and which ones are the most important?

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You can't focus on one factor because they all play an important role in ranking

get working on both on site and off page both shall be balanced !

alex_web said:

You can't focus on one factor because they all play an important role in ranking

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good point