Here are a few other options if you're curious (or if you're like me an run into install errors on Eclipse)
This one's arguably better than Eclipse and most devs I know use this: MavensMate - http://mavensmate.com/
These two are best if you're just starting off (since no install is required): Developer console - click Your Name >> Developer Console after logging in to Salesforce Web UI - log in and go to Your Name >> Setup >> Customize >> Any Object >> Triggers
You can use Eclipse Juno (4.2) or Eclipse Kepler (4.3). For Setup and Installation steps find the below link,
https://developer.salesforce.com/page/Force.com_IDE_Installation
Thanks...!
This one's arguably better than Eclipse and most devs I know use this:
MavensMate - http://mavensmate.com/
These two are best if you're just starting off (since no install is required):
Developer console - click Your Name >> Developer Console after logging in to Salesforce
Web UI - log in and go to Your Name >> Setup >> Customize >> Any Object >> Triggers