C# .Net EntityFramework Core

CLI command to create DB Schema?
dotnet ef migrations add MyFirstMigration
dotnet ef database update
***
namespace MyEntityFrameWorkTest
{
public class GardenContext : DbContext
{
public DbSet&ls;Garden﹥ Gardens {get;set;}
public DbSet&ls;Bed﹥ Beds {get;set;}
public DbSet&ls;Crop﹥ Crops {get;set;}
public DbSet&ls;CropAssignment﹥ CropAssignments {get;set;}
protected override void OnConfiguring(DbContextOptionsBuilder options)
=﹥ options.UseSqlServer("Server=localhost,1433; Database=master;User=sa; Password=Numbernine9");
}

public class Garden
{
[DatabaseGenerated(DatabaseGeneratedOption.Identity)]
public int GardenId {get;set;}
public string Name {get;set;}

public List&ls;Bed﹥ Beds { get; }=new List&ls;Bed﹥();
}

public class Bed
{
public int BedId {get;set;}
public int Number {get;set;}

public int GardenId {get;set;}
public Garden Garden {get;set;}
public List&ls;CropAssignment﹥ CropAssignments {get;set;}
}

public class Crop
{
public int CropId {get;set;}
public string Name {get;set;}
public List&ls;CropAssignment﹥ CropAssignments {get;set;}
}

public class CropAssignment
{
public int CropAssignmentId {get;set;}
public int CropId {get;set;}
public Crop Crop {get;set;}
public int BedId {get;set;}
public Bed Bed {get;set;}
public int Year {get;set;}
}
}
***
namespace MyEntityFrameWorkTest
{
class Program
{
static void Main(string[] args)
{

using (var db=new GardenContext())
{
ReadThisYearsCrops(db);

}
Console.WriteLine("Data has been inserted!");
}

private static void ReadThisYearsCrops(GardenContext db)
{
Console.WriteLine("Getting all the crops for this year...");
var assignments=db.CropAssignments.AsNoTracking()
.Where(ca =﹥ ca.Year == 2020)
.Include(ca =﹥ ca.Bed).ThenInclude(b =﹥ b.Garden)
.Include(ca =﹥ ca.Crop)
.OrderBy(ca =﹥ ca.Bed.Garden.Name).ThenBy(ca =﹥ ca.Crop.Name).ThenBy(ca =﹥ ca.Bed.Number)
.ToList();
assignments.ForEach(a =﹥ Console.WriteLine($"Growing {a.Crop.Name} on bed {a.Bed.Number} in the garden {a.Bed.Garden.Name}"));
}
private static void CreateSampleData(GardenContext db)
{
var garden=(db.Gardens.Add(new Garden { Name="My first garden" })).Entity;
db.SaveChanges();

var bed1=(db.Beds.Add(new Bed { GardenId=garden.GardenId, Number=1 })).Entity;
db.SaveChanges();
var bed2=(db.Beds.Add(new Bed { GardenId=garden.GardenId, Number=2 })).Entity;
db.SaveChanges();
var bed3=(db.Beds.Add(new Bed { GardenId=garden.GardenId, Number=3 })).Entity;
db.SaveChanges();

var pumpkin=(db.Crops.Add(new Crop { Name="Pumpkin" })).Entity;
db.SaveChanges();
var salad=(db.Crops.Add(new Crop { Name="Salad" })).Entity;
db.SaveChanges();
var tomatoes=(db.Crops.Add(new Crop { Name="Tomatoes" })).Entity;
db.SaveChanges();
var beans=(db.Crops.Add(new Crop { Name="Beans" })).Entity;
db.SaveChanges();

var assignment1=(db.CropAssignments.Add(
new CropAssignment
{
CropId=pumpkin.CropId,
BedId=bed1.BedId,
Year=2020
})).Entity;
db.SaveChanges();
var assignment2=(db.CropAssignments.Add(
new CropAssignment
{
CropId=salad.CropId,
BedId=bed2.BedId,
Year=2020
})).Entity;
db.SaveChanges();
var assignment3=(db.CropAssignments.Add(
new CropAssignment
{
CropId=beans.CropId,
BedId=bed3.BedId,
Year=2020
})).Entity;
db.SaveChanges();
var assignment4=(db.CropAssignments.Add(
new CropAssignment
{
CropId=pumpkin.CropId,
BedId=bed3.BedId,
Year=2021
})).Entity;
db.SaveChanges();
var assignment5=(db.CropAssignments.Add(
new CropAssignment
{
CropId=tomatoes.CropId,
BedId=bed2.BedId,
Year=2021
})).Entity;
db.SaveChanges();
}
}
}