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Select, add, edit and delete data in Entity Framework

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Find

Find and Agregate.

var author = context.Authors.First();

var author = context.Authors.Find(1);

var products = context.Products.Where(p => p.CategoryId == 1);

var authors = context.Authors.Include(a => a.Books).ToList();

var authors = context.Authors.OrderBy(a => a.LastName);

var groups = context.Products.GroupBy(p => p.CategoryId);

Add

Add or AddRange.

var author = new Author { FirstName = "William", LastName = "Shakespeare" };
context.Authors.Add(author);
context.SaveChanges();

var authors = new List<Author> {
    new Author { FirstName = "Stephen", LastName = "King"  },
    new Author { FirstName = "William", LastName = "Shakespeare" },
    new Author { FirstName = "Vincent", LastName = "van Gogh"  }
};
context.Authors.AddRange(authors );
context.SaveChanges();

Edit

Update data or update model.

var author = context.Authors.Find(1);
author.FirstName = "William";
context.SaveChanges();

public void Save(Author author)
{
    context.Authors.Update(author);
    context.SaveChanges();
}

Delete

Remove or RemoveRange.

context.Authors.Remove(context.Authors.Find(1));
context.SaveChanges();

context.Authors.RemoveRange(context.Authors.Where(x => x.FirstName == "William"));
context.SaveChanges();