White hat SEO always claims to observe ethical principles in place of illegal principal and they always follow Google guidelines to bring search results on top. They take more time to optimize a web site as compare black hat seo and results are more stable than black hat. White Hat Techniques are ethical whereas Black Hat Techniques are notBlack Hat Techniques are probably illegal and results fall down in short period of time.
Types of black hat practice –
Use more keywords in a page to increase keyword density
Use of hidden text on a page
Use of Doorway page
Use of cloaking Use of redirection to forward traffic on some other page or site
Use of more than one H1 tag in a page
Repetition of same keyword’s in meta tag
And white hat seo techniques are those techniques are those who follow google guidelines and avoid above practice.
When using black hat SEO, the content on a page and links both on and to a page are developed for search engines to see. Humans aren't supposed to see them at all, and various black hat techniques can be used to hide them. While when we using white hat techniques, the content and links are designed for both humans and search engines to see.