How to create login authentication by using asp.net core web api with Angular js client page

I am using Identity Server 4 and trying to enter valid user’s credentials from an angular login page (using Implicit Flow) to allow them to land my application. I am trying to avoid invalid users landed into my application.

I'm entirely newbie to this system. I could not find real time examples from anywhere. Just I request how can I implement OpenID Connect + OAuth 2.0 identityServer4 for Angular and ASP.NET Core web API application? Especially the ASP.NET Core web API, angular 1.x and ASP.NET Core MVC part, it really helpful for me if I get some ideas along with your support.

Thanks,

Parthiban