A good link factor gives you high rankings, leads to relevant traffic and leads to sales. Low-quality seo links are fraught with sanctions from search engines, loss of time and money. How do you recognize those "high-quality" backlinks? According to several criteria. If the resource is promoted with reference to a specific geolocation, links from "local" donors will be much better than others. But it should be understood that it is not easy to find many sites for backlinks within one region. For this reason, the topic is already receding into the background. As for the number of external links, there is no exact figure. You need to focus on your competitors. Since they are liked by the search engine spiders, their link plan is likely to be of good quality. Study your competitors and see what strategy they are using. How do you promote your website?