If you are using more than one audio track in your project, you might need to align the tracks so that they start at the same time, move voice tracks so that they start at the correct times, or even move one track to start later than another. To do all of this, the Time Shift and Align tools can help.
The time shift tool is very easy to use. With your Audacity project open, make sure that the audio track that you want to move is highlighted:
Select the Time Shift Tool.
Click-and-drag the track that you want to move to the desired position.
Release the mouse button to place the track in this new location.
To make more precise time shifts
Zoom in to the audio track. This is easy to do with shortcut keys. When you have the Time Shift Tool selected, you can use Ctrl + 1 on a Windows computer or Command + 1 on a Mac. To zoom out, you use Ctrl + 3 on a Windows computer or Command + 3 on a Mac. Want to go back to the default magnification? Use...