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The first thing to do is read Apple support article.

You’ll want to securely erase that SSD, but it’s a bit tricker than a plain hard disk. These days, because SSDs have been an option for Macs for almost a decade, it’s very likely that you have, or will soon have, a Mac for sale that boots from an SSD. Securely erasing a hard disk isn’t hard to do, and it’s been discussed in many places. Back when I did that last, the Mac had a hard disk. It’s been awhile since I sold an old Mac. If you’re planning to sell a Mac that boots from an SSD, or you have an old Flash drive or SSD you want securely erase, this article has the details.