When doing a clean install with High Sierra, I have the option to do APFS or APFS Encrypted.
If I choose APFS Encrypted, do I also need to do Filevault as well? Is it the same thing?
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Here is what I found useful for me. To avoid a double login situation, or where you see both the User login and Disk Password on the login screen after boot, do NOT select APFS Encrypted in Disk Utility when formatting the hard drive. Select the regular APFS file format, and THEN apply Filevault once you complete setup.
This applies to when you are installing from a bootable usb stick, as it was in my case.
I hope this is helpful for you!