How to Fade In and Out In Adobe After Effects HD

I was testing out an audio waveform over the video to see how it looks. How to Motion Track in Adobe After Effects: http://www.youtube.com/watch?v=CxpVakbeKcY How to create a basic vignette in Adobe After Effects: http://www.youtube.com/watch?v=0rkUWiEyhlQ How to make 3d looking text in After Effects: http://www.youtube.com/watch?v=kICOPNRHxiM How to get and use Twitch AE plugin for free: http://www.youtube.com/watch?v=kICOPNRHxiM