Below is what things to do before selling a smartphone you have to practice yourself.
Wipe all your personal data.
Back up all your data, including contacts.
Log out any services and clear the data.
Encrypt the data on the MicroSD.
Keep the serial number of the smartphone for your record.
List of what things to do before selling a smartphone
Do a factory reset.
Remove devices from your Google account. You can go to myaccount.google.com, sign in & security then under Device activity & notifications. You find your smarphone model and erase it.
Turn off all services including Find My iPhone. Go to settings > iCloud > Find My iPhone.
Sign out of iCloud, start the wipe process with going to Settings > General > Reset > Erase All Content and Settings.
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