Authority
Are you someone who is respected and referenced by others who know something about the subject?
This is where the value of backlinks can come in. It is a way to show that you are an authority on a topic if Google sees many other credible sources citing your content as a source or resource.
Trust
Are you a reputable person or business? Can you be china number data to take good care of your customers and their information?
A factor in determining a site's quality, Google has compiled a list of indicators that may indicate that a site is untrustworthy or spammy. These include things like a high ratio of ads to regular content, behavior that forces users to take actions they don't want to take, hiding some content and only showing it to search engines to manipulate rankings, not using a secure platform to take payment information, and so on.
It is always the same end goal.
Yes, SEO can be technical, and yes, it can change quickly. But at the end of the day, what doesn’t change is the end goal. Google and other search engines make money through advertising, and in order for as many users as possible to see (and click) their ads, they have to provide the best user experience possible. So, their goal is to always provide the best information to searchers, as easily as they can, so that people keep using their service.