Securely wipe your device

macOS

>>>When offloading a Mac, you must cleanse it to keep data safe. Save vital files to another device, then reboot into macOS Recovery (hold Cmd+R as it reboots). Click Disk Utility, then View > Show All Devices. Select the drive you want to erase, then click Erase. Keep the default settings, then click Erase again. If your Mac uses a hard drive rather than an SSD, click Security Options, move the slider to the right, click OK, then Erase (this isn’t needed on SSDs). iOS/iPadOS

>>>Erasing your iOS or iPadOS device is simple but extremely important considering how much personal data is stored on our iPhones and iPads, especially if you frequently use apps like Apple’s Health. To securely wipe your device, open the Settings app, then tap General. Scroll all the way to the bottom and tap Reset, then tap Erase All Content and Settings. You may be prompted to back up things like your iCloud data. Follow the on– screen instructions and wait for the process to complete.