Binding to viewmodel

MainView.xaml

<?xml version="1.0" encoding="utf-8"?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms" xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml" xmlns:local="clr-namespace:mainn" xmlns:accordion="clr-namespace:Syncfusion.XForms.Accordion;assembly=Syncfusion.Expander.XForms"
			x:Class="mainn.MainPage"
             xmlns:vm="clr-namespace:mainn.ViewModels">
     <ContentPage.Resources>
         <ResourceDictionary>
             <vm:MainViewModel x:Key="vm"/>
         </ResourceDictionary>
        </ContentPage.Resources>

    <StackLayout>
       
        <!-- Place new controls here -->
        <Label Text="Welcome to Xamarin.Forms!" HorizontalOptions="Center" VerticalOptions="CenterAndExpand" />
         <Button Command="{Binding Source={StaticResource vm},Path=Move}" Text="GO"></Button>
        <Label Text="{Binding Source={StaticResource vm},Path=FullName}" HorizontalOptions="Center" VerticalOptions="CenterAndExpand" ></Label>
    </StackLayout>
</ContentPage>

MainViewModel.cs

using System;
using System.ComponentModel;
using System.Windows.Input;
using Xamarin.Forms;

namespace mainn.ViewModels
{
    public class MainViewModel  : INotifyPropertyChanged
    {
        public ICommand Move { get; set; }

        private string _fullname;
        public string FullName
        {
            protected set
            {
                if (_fullname != value)
                {
                    _fullname = value;
                    OnPropertyChanged("FullName");
                }
            }
            get { return _fullname; }
        }

        public event PropertyChangedEventHandler PropertyChanged;


        protected virtual void OnPropertyChanged(string propertyName)
        {
            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
        }

        

        public MainViewModel()
        {
            Move = new Command(get => Moveit());
            FullName = "tom";
        }

        public  void Moveit ()
        {
            Application.Current.MainPage.DisplayAlert("hello", "hello", "hello");
        }
    }
}