public class ProjectTypeDTO {
    public string Type { get; set; }
}

public class CourseDTO {
    public string CourseCode { get; set; }
    public string CourseTitle { get; set; }
}

public class ProjectDTO {
    public int Id { get; set; }
    public ProjectTypeDTO ProjectType { get; set; }
    public CourseDTO Course { get; set; }
    public string StartTerm { get; set; }
    public DateTime SignOff { get; set; }
    public DateTime StartDateTime { get; set; }
}

[HttpGet("getallprojects")]
public IActionResult GetAllProjects()
{
    var projects = _context.Projects
          .Select(p => new ProjectDTO
           {
               Id = p.Id,
               ProjectType = { Type = p.ProjectType.Type },
               Course = { CourseCode = p.Course.CourseCode, CourseTitle = p.Course.CourseTitle },
               StartTerm = p.StartTerm,
               SignOff = p.SignOff,
               StartDateTime = p.StartDateTime,
               }).ToList();

    return Ok(projects);
}

var projects = _context.Projects
    .Select(p => new
    {
        p.Id,
        p.ProjectType.Type,
        p.SignOff,
        p.StartDateTime,
        p.Course.CourseCode,
        p.Course.CourseTitle,
        p.StartTerm
     }).ToList();