Once you have installed and configured the rights extension in your application, you can change the table name from 'User' to any table name you want and similarly for 'username' column to any other column name.
If you have read this wiki you would be aware of the yii2-detail-view extension and how it offers you an easy way to EDIT and VIEW your model data, toggle these modes, and other features. You can read the extension documentation and/or view a demo of this extension, to understand usage.
This tutorial is not about allowing users to sign into your application by using any of the OAuth providers available with the official yii2-authclient extension, it is about how to interact with your Twitter account, the one you set for your Yii2 app to promote your site, using the Single Access Token technique.
This wiki will explain how you can use the Field range extension with multiple Bootstrap form layouts (vertical or horizontal). You maybe aware, that the yii2-field-range extension enables you to easily setup ActiveField range fields with Bootstrap styling. You basically can setup two attributes joined together like a single field with combined validation error block.