What is the proper way to use the unit of work pattern

public interface IClass1Repository {
        void insert(Class1 class1);
    }
    public class Class1
    {
        public object Id { get; set; }
        public string Name { get; set; }
    }
    public interface IClass1Service {
        void Insert(Class1 class1);
    }
    public class Class1Service : IClass1Service {
        public IClass1Repository _repo { get; set; }
        public Class1Service(IClass1Repository repo)
        {
            _repo = repo;
        }
        public void Insert(Class1 class1) {
            if (class1 == null) throw new Exception("class1 is null");
            if (string.IsNullOrWhiteSpace(class1.Name)) throw new Exception("class1 Name Cannot Be Null");
            _repo.insert(class1);
        }
    }

public interface ISecondClassRepository
    {
        void insert(SecondClass secondClass);
    }
    public class SecondClass
    {
        public object Id { get; set; }
        public Class1 Class1 { get; set; }
        // Some Other Props

    }

    public class SecondClassService {
        ISecondClassRepository _repo;
        IClass1Service _class1Service;
        public SecondClassService(ISecondClassRepository repo,IClass1Service class1Service) {
            _repo = repo;
            _class1Service = class1Service;
        }

        public void Insert(SecondClass secondClass) {
            _class1Service.Insert(secondClass.Class1);
            _repo.insert(secondClass);
        }
        
    }