Thinking about the advice on how to climb the Google SERP , the most frequent are precisely related to the contents. These must be of the highest quality and never duplicated , not even partially, by other competitor websites.
But this is not always enough.
To avoid penalties, in addition to paying attention to the vietnam phone number content, it is also essential that the optimized for mobile devices (ever heard of mobile first indexing ?) and that they are fast to load . Other ranking factors are then security and accessibility, the general performance of the website, the structure and so on.
In short, it is certainly not an easy job, but Google was born to satisfy the needs of users and these, over the years, have become increasingly demanding . It is therefore normal that the search engine tends to reward those who really invest in terms of optimization and content, penalizing those who have not yet understood the potential of the Web or, worse, use Black Hat SEO techniques.