Your username should be a lower-case word with only letters a-z and numbers 0-9 and without periods.
Your public Solid POD URL will be: https://alice.
Your public Solid WebID will be: https://alice./profile/card#me
Your POD URL is like the homepage for your Solid pod. By default, it is readable by the public, but you can always change that if you like by changing the access control.
Your Solid WebID is your globally unique name that you can use to identify and authenticate yourself with other PODs across the world.
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