What strategies change in seo field after google Humminbird update.?
 

How it affects Google search results?

Effect of Humming bird update in SEO are: Optimize for long tail keyword, make an obvious them of your website, making pages for structurted data, and remember about google universal search result.

Google is using a humming bird search algorithm to give the best possible results.
It is must follow the rules of search engine. You need to change your page ranking strategy because hummingbird looks at PageRank.