How do I link to part of a page? (hash?)
How do you link (with <a>) so that the browser goes to certain subheading on the target page as opposed to the top?
Answer
If there is any tag with an id (e.g., <div id="foo">), then you can simply append #foo to the URL. Otherwise, you can't arbitrarily link to portions of a page.
Here's a complete example: <a href="http://example.com/page.html#foo">Jump to #foo on page.html</a>
Linking content on the same page example: <a href="#foo">Jump to #foo on same page</a>
It is called URL fragment.