The term "white hat" in Internet slang refers to an ethical computer hacker, or a computer security expert, who specializes in penetration testing and in other testing methodologies to ensure the security of an organization's information systems.

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In search engine optimization (SEO) terminology, white hat SEO refers to the usage of optimization strategies, techniques and tactics that focus on a human audience opposed to search engines and completely follows search engine rules and policies...

techniques and tactics that focus on a human audience opposed to search engines and completely follows search engine rules and policies.

White hat SEO is the body of approved search engine optimization tactics designed to increase a website's position on a search engine result page.
few white hat techniques,
1, Quality content
2, Titles and Meta Data
3, Keyword Research and Effective keyword use
4, Quality Inbound Links
5, URL structure