How to swap .col order-?

Question

Bootstrap

Hello! help me please.
the menu should be at the very top on md permissions

<div class="container">
      <div class="row align-items-start header-top ">
        <div class="col-lg-3 block1 text-center img-fluid mt-3 d-none d-lg-block ">
           <a href=""><img src="img/logoNewHeader.svg"  alt=""></a>
        </div>



        <div class="col-lg-6 block2 shadow-sm bg-light rounded col-md-6-order-4">
          <div class="row header-top align-items-center">
            <div class="col block3">
              <p class="maptag">
                <img src="img/mapmarker.png" alt="">Город</p>
            </div>
            <div class="col block4 info text-center ">
              <div class="row info ">
                <div class="col info1"><a href=""><p>Доставка</p></a></div>
                <div class="col info2"><a href=""><p>Оплата</p></a></div>
              </div> 
            </div>
          </div>
          <div class="row header-phone align-items-center header-bottum">
                <div class="col">
                      <a href="tel:[phone]"><p>[phone]</p></a>
                  </div>
                <div class="col text-center">
                  <!-- Button trigger modal -->
                      <button type="button" class="btn btn-link" data-toggle="modal" data-target="#exampleModalCenter">
                         Заказать звонок
                      </button>

<!-- Modal -->
<div class="modal fade" id="exampleModalCenter" tabindex="-1" role="dialog" aria-labelledby="exampleModalCenterTitle" aria-hidden="true">
  <div class="modal-dialog modal-dialog-centered" role="document">
    <div class="modal-content">
      <div class="modal-header">
        <h5 class="modal-title" id="exampleModalLongTitle">Оставьте заявку</h5>
        <button type="button" class="close" data-dismiss="modal" aria-label="Close">
          <span aria-hidden="true">&times;</span>
        </button>
      </div>
      <div class="modal-body">
        ...
      </div>
      <div class="modal-footer">
        <button type="button" class="btn btn-secondary" data-dismiss="modal">Закрыть</button>
        <button type="button" class="btn btn-primary">Отправить</button>
      </div>
    </div>
  </div>
</div>

                </div>
          </div>
        </div>


        <div class="col-lg-3 block6 text-center col-md-3-order-3">
           <div class="row align-items-center header-top">
            <div class="col block7">
              <p class="header-login">Войти</p>
            </div>
            <div class="col block8">
              <p class="header-reg">Регистрация</p>
          </div>
          </div>
        
          <div class="row align-items-end header-bottum hr-1">
            <div class="col">
              <p class="amount">
                0.-</p>
            </div>
            <div class="col ">
              <p class="basket">
                <img src="img/cart.png" alt="">Корзина</p>
            </div>
            
          </div>
        </div>
        <div class="col-lg-12 shadow-sm bg-light rounded col-md-12-order-1">
          <nav class="navbar navbar-expand-lg navbar-light bg-light">
    <a class="navbar-brand" href="#">Navbar</a>
    <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbar1" aria-controls="navbar1" aria-expanded="false" aria-label="Toggle navigation">
      <span class="navbar-toggler-icon"></span>
    </button>

    <div class="collapse navbar-collapse" id="navbar1">
      <ul class="navbar-nav mr-auto">
          <li class="nav-item active">
            <a class="nav-link" href="#">Home <span class="sr-only">(current)</span></a>
          </li>
        <li class="nav-item">
          <a class="nav-link" href="#">Link</a>
        </li>
          <li class="nav-item dropdown">
            <a class="nav-link dropdown-toggle " href="#" id="navbarDropdown1" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">Dropdown</a>
            <div class="dropdown-menu bg-dark" aria-labelledby="navbarDropdown1">
                <a class="dropdown-item text-light" href="#">Action</a>
                <a class="dropdown-item text-light" href="#">Another action</a>
                <div class="dropdown-divider"></div>
                <a class="dropdown-item text-light" href="#">Something else here</a>
            </div>
          </li>
      </ul>
      <form class="form-inline my-2 my-lg-0">
          <input class="form-control mr-sm-2" type="search" placeholder="Search" aria-label="Search">
          <button class="btn btn-danger my-2 my-sm-0 " type="submit">Search</button>
      </form>
    </div>
</nav>
        </div>

        </div>
      <div class="row ">
        
        
      </div>  
      </div>

example

Answer 1

add order.
The 4th bootstrap even has classes in .order-md-1 https://getbootstrap.com/docs/4.0/utilities/flex/