I need help wiping my MacBook Air 2013
can you help me wipe my Mac?
Earlier Mac models
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Is there an underlying problem that is plaguing you? If so, what is it? You may not need to wipe your drive. If you do. and don't reinstall the OS, you'll have a quite expensive paperweight.
If you wish to sell, give away or trade your Mac, the referring article is the definitive answer to your question.
What to do before you sell, give away, or trade in your Mac - Apple Support