2, the title and description should comply with the user experience. We want to appropriate target keywords when determining the site title, will appear in the description of the keywords. The title and description of the website is on the site as a whole, the weight of search engine in this part of the content is very high.
5, 404 pages, check the website robots.txt files, static links, tree structure, URL standardization, which all do not have blind spots. Strictly check the web page links, web pages appear the most taboo death phenomenon.