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WHAT
Triển khai các chức năng của chương 6, bao gồm xác thực người dùng, tạo/sửa/xóa user, v.v.
HOW
Thêm các migration, model, controller, view liên quan đến user.
Sử dụng has_secure_password để quản lý mật khẩu an toàn.
Áp dụng validation cho user (tên, email, mật khẩu).
WHY
Hoàn thiện chức năng cho chương 6 trong Rails Tutorial.
Đảm bảo bảo mật và tính nhất quán khi quản lý user.
##NOTE (Kiến thức tìm hiểu thêm)