1、 Quality of website import links
The quality of guided links directly determines the PR level of websites. Many people mistakenly believe that the more imported links, the higher the PR of the website should be. In fact, search engines determine that PR is based on the quality of imported links and Website production So when you do import, don't do it on all websites, especially some blog websites. Once a friend made 10 import links every day, but when updating PR, the website PR was still zero. After repeatedly searching for the reasons, we finally found that all the links were made on websites similar to those shown in Figure 4-13. 
Fig-13 Now the blog system is not the same as before. The website has added a nofollow tag on the comments. This tag means that the search engine is not allowed to crawl the links in it. Therefore, adding your website to the website link comment box as shown in Figure 4-13 will not play any role. The quality of such links is zero. If the import links are all as shown in Figure 4-13, it is equivalent to not doing so. When PR is updated, the PR of the website is still zero.
If you exchange links with others to add import links, you need to check their websites in an all-round way, mainly checking the following four points:
1. The volume of the website. Check the number of websites to see whether the other website is K (zero). If it is K, it means that such website has been punished by the search engine. It is harmful and useless to exchange links with such website.
2. What is the PR value. Look at the PR value to see how much the other party's website can deliver to your website, so you should do the best to exchange links with high PR websites.
3. Is the website snapshot in recent days. The snapshot of the other party's website is to confirm whether the other party's website is constantly updated. If there is no updated website, search engines do not like it. If they exchange links with such websites, their own websites will also be affected.
4. Whether it is related to the website content. When making exchange links, try to make links with websites related to the content of the website. If it is a clothing website, find some websites selling Korean clothing, men's clothing, clothing information, clothing shopping guides and other topics to exchange, and the PR value will rise quickly. If you exchange links with websites like rubber, even if its PR value is high, the effect will not be ideal.
2、 Number of export links
Exporting links will not result in the loss of PR value, but the reduction of voting power. However, we should not exchange links without fear. Here are some suggestions:
1) The number of export links should be appropriate
The number of exported links on the website is appropriate. Google thinks it is appropriate to export links within 100. Baidu is not clear that 100 links are not all friendship links, but also links from the website itself to the inside page. Don't misunderstand that 100 links are links to external websites. If that is the case, the user experience will be quite poor. Don't forget that the final goal of the website is to sell products. Therefore, the number of friendship links on a page should have a certain degree. The author believes that the number of friendship links should be around 30.
2) Check the other party's website when making export links
When making export links, you should also check the other party's website to see if the other party's website has been punished by search and climbing. If there is no punishment, see how relevant the content is to your website. It is better to exchange with the website with high relevance. At the same time, you should also check the number of exported links on the other party's website, and try to choose those with fewer exported links for exchange.
3) Pay attention to the rel="nofollow" tag on the other party's website
Some people are very cunning. Add the above code to the friendship link. The above code simply means that no weight is transferred. For example, if a PR8 station gives you a link, if rel="nofollow" is added, it is not as good as a PR1 station without this label. This code has been widely used in blogs, and some webmasters have also been using it, so you must pay attention when exchanging links.
4) Whether PR is hijacked
3、 Number of pages of a website included in the search primer
Now most SEOs only care about two issues, one is keyword ranking, and the other is the outer chain of the website. In the QQ group, people often publish their keyword rankings. They are studying how to obtain high-quality external links every day, and people often ask where the external links of websites are obtained. These all ignore a problem - the amount of the website's collection. You should know that the amount of the website's collection also has an impact on the PR value.
The more pages a website is included by a search engine, it means that search guides believe that the higher the quality of the website's content, the more valuable it is, and therefore the higher the PR value given to the website.
4、 Home page PR value
Usually, the PR value is the PR of the page, not the PR of the whole website. The website has many pages, but the PR value of each page is high or low. The home page is the main page of the website, and its PR value plays a great role in the whole website. The PR value can be transferred to the inner page. The trend of PR value is home page>first level page>second level page>blue level page... PR will be reduced by 1-2 grades for each in-depth level. A deeper level may not be included in the rating range. Of course, if a deep internal page has many external or internal links, the situation is another matter. Therefore, the size of the home page PR value directly affects the value passed to the inner page. Usually, when exchanging links, the home page is exchanged, and there are a few cross links.
5、 File Type
Web pages and file types that can be indexed by search engines generally include: PDF, ASP, JSP, HDML, SHTML, XML, CFM, DOC, XLS, PPT, RTF, WKS, LWP, WRI, SWF. Among these file types, search engines will consider PDF files as the most important content, and often give it a higher weight than ordinary HTML files. Similarly, the PR given by search engines to XML, PS, Word, Power Point, Excel and other types of pages is also higher than that of ordinary web pages. Therefore, if important content does not want to be made into a web page, it can be made into PDF format.
