Domain parking refers to the registration of an internet domain name without that domain being associated with any services such as e-mail or a website. This may have been done with a view to reserving the domain name for future development, and to protect against the possibility of cybersquatting.
Heading tags, as the name implies, are tags that are used for the creations of headings. The most important tag is the <h1> heading tag, and will usually be the title of a post. Heading tags have a top-down hierarchy from <h1> to <h6>. ... There are two ways heading tags can structure your content
A Web crawler, sometimes called a spider, is an Internet bot that systematically browses the World Wide Web, typically for the purpose of Web indexing (web spidering).
Keyword stuffing" refers to the practice of loading a webpage with keywords or numbers in an attempt to manipulate a site's ranking in Google search results. Often these keywords appear in a list or group, or out of context (not as natural prose).
Off page SEO refers to techniques that can be used to improve the position of a web site in the search engine results page (SERPs). Many people associate off-page SEO with link building but it is not only that.