I will create a web application using blazor

Responsive design refers to design that looks good on all screens. The design automatically adjusts to different screen sizes.

Form validation ensures that before submitting data to the server, all required form controls are filled out, in the correct format. Most sites with registration forms provide feedback when the user doesn't enter data in their defined format. The user gets messages like: "Please enter a valid email"

In a SPA, the complete website is downloaded all at once and all the subsequent navigations across the website's pages occur by showing/hiding the relevant sections of the already downloaded site. This significantly increases the navigation speed between different pages. Example SPA: airbnb.com

It is the most secure form of authentication. The server upon verifying the users' identity, responds with a token. Rather than having to re-enter credentials each time they navigate to another page or switch tabs, the same token provides authentication. Tokens offer a second layer of security.

This is something that you must have encountered before on the internet. Websites nowadays, provide the option of signing in to their platforms using popular services like Google and Facebook. OAuth authentication helps users share information about their accounts with third-party applications.

With role based authorization, users can be assigned different roles with varying permissions. Different views of the same application are provided to the users based upon their roles. For example, only an admin user, upon authentication, will be able to see the admin portal.