Anchor Tags 
<a href="url" target="_self">Link Text</a>

An HTML link is displayed differently. Been visited, is unvisited, or is active. In CSS: 
a:link - styling for an unvisited link
a:visited - styling for a visited link 
a:hover - styling for when a link is hovered 
a:active - styling for when a link is being clicked on

To link to other sources.

Links HTML
Other Link Types 
<a href="mailto:example@gmail.com"> Send Email </a>

<a href="tel:123-456-6789"> Call Phone Number </a>

<a href="callto:+91123-456-7890"> Contact on Skype </a>

<a href="SMS:+91123-456-7890"> Send SMS </a>

<a href="fax:+91123-456-7890"> Send Fax </a>

Send emails or call phone numbers using links.

Links HTML
Target Attribute 
target="_self" - default | opens in same window
target="_blank" - open in new tab
target="_parent" - opens in parent frame
target="_top" - opens in full body of the window
target="framename" - opens in a named Iframe

To set where links should be displayed.

Links HTML
Element Links 
<a href="link.com" target="_blank">
  <div>
    Anything goes here
  </div>
</a>

Can make anything into a workable link.

Links HTML
Jump To 
<a href="#1">Section 1</a>
<a href="#2">Section 2</a>
    
<h2 id="1">Section 1</h2>
<h2 id="2">Section 2</h2>

Jump to a specific section of a webpage. Can use any element. Match id attributes with href ones prepended with a #.

Links HTML