The below shows ways to navigate other than using the menu.

Routing for Pages

The routing generally goes at the top of the razor file.

//In the razor page:
@page "/pagetonavigateto"

//With a parameter value
@page "/pagetonavigateto/{id:int}"  //if the id is a int there are various types you can use such as bool, string etc.

Using <a> Tags

<a href="/pagetonavigateto/parametervalue">Click Here</a>

Using Buttons

In the razor file to navigate from

<button class="btn btn-primary" @onclick="Method">Click Here</button>

In the razor code section or the base class file

void Method()
{
    NavigationManager.NavigateTo("/pagetonavigateto/parametervalue");
}

You will also need to inject the NavigationManager into either the razor file or the base class file

//In the razor file
@inject NavigationManager NavigationManager

//In the base class file
[Inject]
NavigationManager NavManager { get; set; }