? Complete Newb Guide ?

[eluser]Jimmi Newbie[/eluser]
haii my name's jimmi. I am newbie in CI.
I want ask to senior CI ^_^. Em... in php coding usually I use this.
Example:

Code:

<?
echo "<a href='?action=input'>Input Form</a>";

if (!empty($action))
{
   echo "Input OK";
}
?&gt;

how if in CI..??

thank you