How can I store passcodes securely on my phone?
There is a passcode section on my phone for storing passcodes. Is it secure? How do I use it?
iPad Pro 10.5-inch, Wi-Fi, Cellular
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You can setup iCloud Keychain:
Set up iCloud Keychain - Apple Support
I'm sure there are other third party (non-Apple) apps you can find on the App Store.