Proper way to implement Username-Password only authentication in a collection

What is the proper way of implementing username/password login and registration, I don't want any email field.

I have tried making custom UI for edit and custom route for creating users, but when I try to create a new User it is giving me various types of errors (like it still expects an email in operations/create, confused about the strategies as well) and at this point I think I am doing it wrong way. can you guys please suggest a proper approach to achieve this.