Following an external chain training exercise, the concept of the external chain has become more systematically understood, as follows:。
The seo optimization is the optimization of the search engine, which generally affects the seo optimization, with problems in-station seo and off-site seos. For the off-site seo part only, it is the inverse link that affects the off-site seo part that is short of a back chain。
I. Counterlink
1. Definitions: only the listed links have an effect on the ranking of websites. We call the link that has facilitated the website the back chain. Counter-chains include the external and inner chains that are recorded。
2. A common website is supported by external and inner chains. These links connect information to form a clear line。
(1) internal chain: within a web site, many pages are required to be linked to each other, forming a complete information site. As one page does not contain all the information, the site will have a home page and separate pages. And the link between the serial home page and the break, the break and the break, is the " inner chain"。
For example, the website is navigating and the links to articles that are regularly updated are inner chains. The common inner chain of a large site is more important, requiring a clear connection linking the various parts of the site, but more important for the outer chain of a small site. Because the inner chain belongs to seo in the station, not much here。
(2) extra-chain: refers to the import of links from other websites to their own websites. It is difficult for one site to be comprehensive, and links to other sites are needed to absorb additional information that can be added to others。
Ii. Basic shape of the outer chain

1. Hyperlink: click on the form of link that can jump directly. Includes direct link forms, anchor text links and photo links. (with examples)
The anchor text is more effective in the ranking of keywords because it optimizes the link by using keywords in the link text, linking your web page to keywords like anchors and enabling spiders to climb to more keywords。
2. Pure text links: shown only for one link, not click jumps。
Iii. Main forms of outward chain publication
1. Fees: press releases, purchase of links, advertising, etc
2. Free: exchange links, forums, blogs, information platforms, etc
(1) the main role of the forum is to attract spiders, so we need to make sure that when we publish it, we get it big = 50%, the discount rate > 75%
The main role of blogs is to raise the weight of the website, so we need to look for high-quality and high-priority blogs that will be recorded at >40%. In the early stages of blogging, we need to post high-quality, unlinked articles to support blogs, and we need to increase the weight of the website by making certain entries before posting articles in the outer chain。
(3) the information platform needs to ensure its breadth, so the requirement is 50% root area, discount rate 90%
Iv. Methodology for finding an outer chain platform
1. Use of search engines

2. High-quality external chains of competitors analysed using station master tools
3. Join the relevant qqq group for communication and resource search
4. Sharing of resources among colleagues
V. Principles of outer-chain construction (both in terms of outer-chain platforms and outer-chain content)
Relevance
Prevalence
3. Scope
4. Quality
5. Stability
Vi. The role of external chain-building
1. Increased availability of websites
Increased website weighting
3. Raise the ranking of keywords
4. Increasing website exposure
5. Bringing traffic to the website




