What is secure SEO ? Can forum give me the concept of this terminology ?
Good original content, well implemented on page optimization and a solid link building campaign is usually more than sufficient for SEO.
If you follow Google's quality guidelines to promote your website then it is secure way of promoting your website. if you promote your website using any unethical activities then google will penalize your website.
Http is most commonly used to access html pages, and it is important to consider that other resources can be utilized through accessing http. This was the way that most websites who did not house confidential information (such as credit card information) would setup their websites.
HTTPS, or "secure http", was developed to allow authorization and secured transactions. Exchanging confidential information needs to be secured in order to prevent unauthorized access, and https makes this happen. In many ways, https is identical to http because it follows the same basic protocols. The http or https client, such as a Web browser, establishes a connection to a server on a standard port. However, https offers an extra layer of security because it uses SSL to move data.