Watch video: How to Remove Background Noise from Audio Recording
Notice the flat line. That is noise. After watching this video you will learn how to remove the noise from the background. In the video I used a bad & old mic, but thanks to Audacity Nore Removal feature, it’s crystal clear. Check out the video.
Other Audacity Tutorial
Here’s a list of some Audacity tutorials in the web.
http://www.guidesandtutorials.com/audacity-tutorial.html
http://audacity.sourceforge.net/manual-1.2/tutorials.html
http://wiki.audacityteam.org/wiki/Category:Tutorial