My computer disk is full (on my macbook air)

how do i empty it?

First, you may want to save files or groups of files to an external drive, for archiving. Using Finder windows, you will simply drag and drop files and folders to the external drive you wish to use. What you will be left with is files you want to keep, and those you want to delete.
The Next thing you want to do is evaluate the drive. The evaluation will indicate two things of importance. What files are taking up space, and how much is each one taking up. From this, you will simply prioritize and implement removal.
There is Onyx, Daisy Disk, and Grand Perspective to evaluate disk usage and find files suitable for deletion.
I personally like Grand Perspective. From the interface, you can san your hard drive, then click on files, represented by boxes of varying size (indicating relative file size and name), and then hit a button titled "delete", to move them to the trash.
Lastly, you empty your trash.
http://grandperspectiv.sourceforge.net/

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    <Edited by Host>

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