"Rel = nofollow" attribute-seo Basics

"Rel = nofollow" attribute

NofollowIt is a value of the content attribute of the HTML meta tag and the rel attribute of the link tag (A), telling the machine (crawler) that the target page does not need to be tracked, to combat blogspam (blog spam information), Google recommends nofollow,Tell the search engine crawler not to capture the target page, and tell the search engine not to pass the PageRank of the current page to the target page. However, if you submit the page directly through sitemap, crawlers will still crawl the page. The nofollow here is only an attitude of the current page to the target page, and does not represent the attitude of other pages to the target page.

• 1 Nofollow usage
• 2 Role of nofollow
• 3 PR trim (PageRank Sculpting )
• 4 Seo recommendations
• 5. Seo Basics

Nofollow usage

Nofollow has two usage methods:
1. Used for Meta Tags: <meta name = "Robots" content = "nofollow"/>, telling crawlers that no trace is required for all links on the page.
2. For tag a: <a href = "login. aspx" rel = "nofollow"> log on </a>, telling crawlers that this page does not need to be tracked.

Role of nofollow

Nofollow has three main roles:
1. prevent untrusted content. The most common is that spam messages and comments on a blog are used to obtain spam links from external links and prevent pages from pointing to pull pages and sites.
2. Paid link: to prevent the paid link from affecting Google's search result ranking, Google recommends the nofollow attribute.
3. Guided crawlers capture valid pages: Avoid crawlers crawling meaningless pages and affect the crawling efficiency.

PR trim (PageRank sculpting)

Nofollow abuse, some Seo In order to achieve the maximum optimization of search engines, through nofollow to control the flow of PR, can be very good to optimize some specific pages. Of course, this optimization is suitable for some old sites that have accumulated a considerable number of PR. To prevent the abuse of PR pruning and nofollow, Google has weakened the role of nofollow. The previous nofollow will not only cause PR flow, but also do not cause PR loss, although the current nofollow rule does not cause PR flow to the target page, the original flow to the target page will be lost. For example, if the current page PR is 1 and there are 10 links on the page, one of which is the nofollow link. According to the previous nofollow rules, each non-nofollow link points to the target page and will get 1/9 PR. links containing nofollow cannot get PR, but according to Google's new nofollow rules, A non-nofollow link can only get 1/10 of the target page, and a nofollow link cannot get PR, that is, 1/10 of the PR is lost.

Seo recommendations

Nofollow has a weak role in Google, So Seo needs to control the flow of site PR to avoid links pointing to spam pages. It can only be manually reviewed.

Seo Basics

URL Normalization)
Keyword stuffing)
Cloaking, camouflage, and blind eye
Bridge page, doorway page)
Link error (link rot)