.net identity & new table

I'm still trying to grasp a bit more .net identity. If anyone want to give me advice please do.
  1. No auth endpoint are needed to be definid if I configure webbuilder and apphost correctly right?
  2. If I wanted to make user profiles, a smart thing would be to make a different table and join them on UserId key?
  3. What's a good way to debug these endpoints?
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