External chain
 

Links: friendship link is the highest weight, so be sure to pay attention to, as far as possible with your own website related station exchange, also want to pay attention to export links, snapshot, included wait for a circumstance, as far as possible with high quality site exchange, do friendship chain must anchor text to do, so that only the best effect.
Anchor text: anchor text SEO is also the most important concept, simple speak with a hyperlink is the keywords that anchor text, in the outer chain, the best effect is to be anchor text.
Web site: a lot of places and all do not allow with hyperlinks, can only leave text links, of course, to improve the weight of website is also a help, is effect is very small, so long as quantity is big enough, or play a good effect.