Because of the thing of friendly link, there is one rule in some guidance given by search engine to webmasters: be cautious to set your friendly links! Today we don't talk about friendly links. We specially talk about the operation of black links! In fact, the operation of black links is very simple. It can be summarized into four words: moderate and regular! Regularity, we have just talked about moderation, next, let's talk about regularity. Why should we add black links regularly? Because we all know that black links are the links we buy. Relatively speaking, we have control over these links, so they are different from the normal exchange of friendly links in Jinan website building. No matter how powerful you are, you can exchange at most four or five, five or six friendly links every day, which should be enough! To be honest, this regularity is actually developed around moderation. Because of moderation, when adding links, we need to be regular. Those who do SEO should know that search engines have a parabola-like graph for the growth of external links of each site. Generally speaking, the growth of external links of a normal website is slowly rising in a parabolic shape, while the growth of black links or purchased links is basically straight up. Then, when the time of your link purchase expires and you don't renew it, he will remove all your links, and then your links will drop straight down. Therefore, search engines will definitely pay extra attention to such external link growth graphs. If your site is indeed excellent, the impact may not be great. However, after detection, if your site is purely a junk site, the outcome will be pretty bad! The operation of black links, many SEOers still have doubts about black links, that is, are black links useful? Here I can definitely tell you, black links are useful, and their effect is even greater than exchanging friendly links! Why? Because black links are actually equivalent to one-way links made by others for you! Regarding optimization, our suggestion is to do one-way links as much as possible instead of doing friendly links! Moderation is the grasp of degree when putting on black links. Many people do black links, but the result is counterproductive, and the site gets penalized. The main reason, I think, should be the lack of control over the quantity! Let me give you a very simple example: your site is not yet mature, and you go to buy black links. At this time, take matchmaking for example, there are usually such people, he bought a thousand yuan worth of links, then these thousand yuan worth of links are basically all added within a day, some even added within a few hours. According to the normal market price of black links, a thousand yuan worth of black links, I estimate there are at least one or two hundred sites! And they are relatively better quality ones. We can calculate, today we can calculate less, count the inclusion of those sites that add black links for him as 200 per site, because we all know that many people, usually when buying black links, in order to pursue more backlinks, they often require those who sell black links to add whole-site links for them! To be honest, the horror of black links lies in whole-site links. Previously, we calculated that with a thousand yuan, you could buy about 200 relatively decent quality links. Currently, a PR3 black link is only three yuan, so with a thousand yuan, buying two hundred good links is more than enough. Each site's inclusion is 200, which is also calculated quite less. Generally, sites reaching PR3 have more inclusions than this number. Now we can calculate for Jinan website building, 200*200=40000! See that, 40000 links, having forty thousand external links increase in a day, I say, even if the search engine is a fool's invention, I estimate it would still think your site is abnormal! Therefore, the result is either being penalized or devalued, etc.! And my previous calculation was quite conservative! Therefore, regarding black links, my suggestion is that if you don't have a certain SEO foundation and relatively good experience, don't easily make black link transactions with people selling black links. Of course, if there are people with experience in this area guiding you to put on links, it is acceptable!