HyperLinks ('links' for short) are what make the internet special, without them, you wouldn't be able to visit websites, send email, and a whole lot of other stuff. The basic syntax is as follows...
<a href="http://www.google.com">Click here to Search</a>
A stands for Anchor, and it begins the link to another page.
HREF stands for Hyper REFerence. Basically, it means "this is where the link goes to".
"http://www.google.com" is the location of the link. Where it points to. This can be a full URL, as above, or a link to another document which would be "page2.html". It is in quote marks because it is an Attribute of the link tag. Attributes must always be within quote marks, [this is why].
The bit in plain english is the text that will appear as a link for the user to click on. So write something useful that explains what the link is, don't just put "Click Here", as it doesn't tell you anything.
/A Ends the link
How do I get a button which takes me to a new page?
<FORM ACTION="[URL]" METHOD="GET">
<INPUT TYPE="submit" VALUE="Text on button">
Don't use these extensively, however. Not only are they ugly, but they make navigation difficult (mouse hover facilities such as status bar messages, and the ability to open the link in a new window are disabled).
How do I link to a location in the middle of an HTML document?