Angular component doesn't show up
It isn't how Angular works : you can't just render your components into a .html file.
As a SPA (Single Page Application), your content is rendered into a container (app-root by default).
It advice you to follow the official Angular tutorial to understand how components are rendered into the application.
Html not showing list from Component in Angular
Bad field names. Should be:
<th scope="row">{{user.username}}
<td>{{user.id}}</td>
<td>{{user.role}}</td>
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