Two Factor Authentication for iCloud
To begin, open up System Preferences | iCloud. In the resulting window, click Account Details and (when prompted) enter the password for your Apple account (not the password for your macOS device). Click the Security tab and then click Turn On Two-Factor Authentication (Figure A).

Figure A

Enabling two-factor authentication.

Some people using the new iOS 11 have been encountering a strange issue where their predictive text.

It seems that some users are seeing “A[?]” as the first word that is recommended when using the default iOS keyboard, and so when the letter “I” is typed, it gets autocorrected to A[?].You can see the example below.

Turn off lockscreen notifications- Even if you have a strong password possible, your private data can be revealed by notifications on your lockscreen. This could be appointments, confirmation codes, financial data, etc. The less information that shows up on your screen the better your security will be.

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