Here are many examples of how to use hyperlinks in XHTML.
Text Link
<a href="https://www.google.co.uk">Link Text Here</a>
Link to webpage in child folder
<a href="parentfolder/childpage.html">Link text here</a>
Link to webpage in parent folder
<a href="../parentpage.html">Link text here</a>
Open link in new window
<a href="page.html" target_"blank">Link text here</a>
Jump to link
To make a link to jump to part of a page we can create an anchor point in the page, then link to it.
<a name="Jumpto1">Content to jump to</a>
The we use this to create a link to that content.
<a href="page1.html#Jumpto1">Link text here</a>
Hyperlinks from Images
<a href=https://www.google.co.uk><img scr="image1.png" alt="Image description here" title="This shows on mouse over" /></a>