Blog.Turnmeup\src\Blog.Turnmeup.API\Infrastructure\Mapper.cs

using AutoMapper;
using Blog.Turnmeup.DL.Models;
using Blog.Turnmeup.Models;

namespace Blog.Turnmeup.API.Infrastructure
{
    public class MappingProfile : Profile
    {
        public  MappingProfile()
        {
            // Add as many of these lines as you need to map your objects
            CreateMap<Course, CourseResponseModel>();
            CreateMap<CourseResponseModel, Course>();
        }
    }
}