Where you can invite the crawler to your WebPages for  indexed by the search engines. But there may be some content that we don't want to be crawled & indexed. Like the personal images folder, website administration folder, customer's test folder of a web developer, no search value folders like cgi-bin, and many more. The main idea is we don't want them to be indexed.

Heading is use to adorn the title. In that not use bold tag or other tag.

Anchor Text Is the Visible and click able text in a hyperlink .Anchor text is text which is provide hyperlink for particular page (URL) on your website to jump destination page. Example:
<a href="http://www.LinkAnchorText.com/">anchor text</a>.