How to scratch more space on Mac Book Air?

We have a Mac Book Air used by a previous user and now has been passed to a new employee. We notice the space is limited so we would need to delete the files particularly created by the previous user. How to do that? Can I simply delete the previous user and that will also delete his documents, etc as in Windows? Please help.
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Scott CSenior EngineerCommented:
Yes, deleting the user will reclaim the disk space.

Here is what you need to do if you want to preserve the files of the previous user.

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Gerwin Jansen, EE MVETopic Advisor Commented:
Does this model have the SDcard slot on the side? You could add a nifty drive and add (data) storage:
Those Nifty Cards are quite expensive compared to a regular SD Card or even a USB 3.0 Memory stick.  The only advantage is that it's nearly flush with the system.

If you're going to expand the SSD, just buy a 3rd party SSD expansion chip.  You may need a pentalobe screwdriver and you'll have to match the correct model to make sure it will work.  They include a little external case for you to put the old SSD in and you'll have an external SSD.

Otherwise, just delete the user and the associated folder.

If you want to wipe the system clean, reboot into Recovery Mode by holding command r while it's booting up.  Select Disk Utility to Erase the Disk, then quit Disk Utility.  Select Recovery and you'll get download and install a brand new copy over the internet.
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