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ASP.NET Core MVC : default view & route

I have an ASP.NET Core 3.1 MVC router question.
When I change index route to [Route("Index")] in HomeController enter image description here, and then enter the url localhost:5000/index in web browser, it works!
But in my ASP.NET Core MVC project, the default startup url is localhost:5000/home/index enter image description here.
Question
How can I change the default startup url to localhost:5000/index?
I wish use localhost:5000/home/login to visit the login function in the HomeController.

Add following route before your default route.
endpoints.MapControllerRoute(
name: "customindex",
pattern: "index",
defaults: new { controller="Home", action="Index"});
});
pattern can support default value but it works with common scenario like controller/action but if you want specific pattern then you have to specify pattern and also set defaults so those will supply as route value in order to identify action to call.

MVC core routing not functioning as expected

So it's my first time setting up an netcore MVC based application. I've used MVC 4 in the past on plain old asp.net.
So i'm having issues with my routing. My application is an single page application (spa) that is accessible from the home controller on the index action. I can access this controller method fine, and my defaults are set so that this is navigated to at route: /.
I also have a second controller for authentication called AccountController. This controller's methods take and return JSON, rather then views. I can also access the methods on this controller from my application.
The issue i'm having lies in my next controller, which is the start of my API.
As such, i've put it in a folder called api inside my controllers folder. However, no matter what i try, i cannot seem to get the methods on the controller accessible. I have also tried moving it out of the api folder and just having in the route of the controllers folder.
The routing deffinition
app.UseMvc(routes =>
{
routes.MapRoute(
name: "api",
template: "api/{controller=Core}/{id?}");
routes.MapRoute(
name: "default",
template: "{controller=Home}/{action=Index}/{id?}");
});
I've tried adding and removing the api definition, removing the api part, and adding a template for actions aswel, all to no effect.
The troublesome controller
public class CoreController : Controller
{
[HttpGet]
public JsonResult Get()
{
return Json("Dev");
}
}
I've tried adding [Route(~routing here~)] annotations to this controller and its methods with no success either.
Folder structure
I should also mention that i've tried plenty of URL's to access this controller on:
/api/Core/
/Core/
/api/Core/Get
I've been wracking my brain for the best part of a day trying to get this sorted and i know i'm missing something obvious, i just can't for the life of me work out what it is.
Edit:
I've added a cut-down sample of my project to github at: https://github.com/lexwebb/aspnet-test if anyone would like a complete example
Edit 2
It appears that my example works, i'm going to add things in to see what breaks it

AFAIK, default route requires the {action} using as well.
Instead of "api" default routing, you may to use the following configuration for such type of controllers (RESTFul controller):
[Route("api/[controller]")]
public class CoreController : Controller
{
[HttpGet]
public JsonResult Get()
{
return Json("Dev");
}
}
I found this Routing is ASP.NET Core article useful in the past.

So as it turns out, i had made a mistake in a totally unrelated place. I had renamed my project half way through the beginning stage of development, after i had build scripts in place. This led to the the wrong dll being referenced on the server when the code was ran, a version that had all of my routing EXCEPT the new one, of course.

How do I create pages in a web api project?

I want to display a default status page for my web api project (where instead some IIS message is displayed when I start the project). However it seems like I cannot create views in web api (there is no support for ActionResult).
In addition to a status page I will also use this information to create an api documentation page.
How can I achieve displaying html pages in this situation ?

If your default status page is static html, you don't have to use MVC. Just tell WebApi in your Startup.cs that you want to support static resources:
app.UseFileServer();
For creating an API documentation, maybe you could write that file on startup dynamically?

You can create regular controllers and views in a webAPI project the same as any MVC project. Just create a normal controller that does not inherit from ApiController. In your startup.cs make sure to configure at least a default route.
configuration.Routes.MapHttpRoute(
name: "someName",
routeTemplate: "{controller}/{action}/{id}",
defaults: new { id = RouteParameter.Optional }
);
Right click and select Add, then you should see controller at the top. Select one of the mvc controllers.

Custom url for different ActionResults?

I am in the process of moving old website to a new ASP .Net MVC website. The old site has pretty bad url naming scheme. I would love to ignore the old ways and just create new urls, however, A LOT of links point to the old links for SEO. Therefore, I have to maintain the older url.
So let's say this is the old url:
web.com/items/products/Hello-World-Hyphens
How do I input that on MVC?
I got ProductsController:
ActionResult HelloWorldHyphens() { return View(); }
Which will output to web.com/products/HelloWorldHyphens
However, I need it written in the old ways. Starting with /items/ and having hyphens in controller name.
Is there a way I can do something like this?
[OutputUrl="/items/products/Hello-World-Hyphens"]
ActionResult HelloWorldHyphens()

As you are moving to a new ASP MVC website then you can take advantage of attribute routing in MVC 5.
If you add attribute routing when you register your routes:
routes.MapMvcAttributeRoutes();
Then you can add routes on methods:
[Route("/items/products/Hello-World-Hyphens")]
ActionResult HelloWorldHyphens()

Routing controllers in .Net MVC 3

I have created a folder admin inside controller folder and wrote few controllers in it. I want to access all functions in that controllers in that folder by a url like abc.com/admin//.
I can get it working directly when its put directly in controller folder.
EDIT
WHAT HAVE YOU TRIED?
Just created a folder and wrote normal controllers in it. But I don't know how to route it.

Well, i would suggest, rather than just creating a folder and create controllers inside of it. You should create an Area
When you create an Area in asp.net mvc, it will automatically create folders(controller, model etc) for you. And the routing setup as well.
For more info, please visit
http://www.codeguru.com/csharp/.net/net_asp/mvc/article.php/c20227/Using-Areas-in-ASPNET-MVC-Application.htm

Add a route for the admin controllers in your route config if you want to support that path in the URL. Something like:
routes.MapRoute(
name: "Admin",
url: "admin/{controller}/{action}/{id}",
defaults: new { controller = "Home", action = "Index", id = UrlParameter.Optional }
);
But #DotNetDreamer is right that Areas are a better solution for the admin functionality of your site.