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.
CastlewoodAsked:
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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.

https://support.apple.com/kb/PH10754?locale=en_US

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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:

http://www.apple.com/uk/shop/product/HF156ZM/B/nifty-drives-minidrive-for-macbook-air
serialbandCommented:
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.  http://www.amazon.com/s/ref=nb_sb_noss?url=search-alias%3Daps&field-keywords=macbook+air+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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