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<!-- VERTICAL -->
        <ul class="flex-column">

  <!-- RIGHT ALIGN -->
        <ul class="justify-content-end">

<!--Dropdown list item here -->
                  <li class="nav-item dropdown">
                    <a href="" class="nav-link dropdown-toggle" data-toggle="dropdown">Dropdown</a>
                    <div class="dropdown-menu">
                      <a href="#" class="dropdown-item">link 1</a>
                      <a href="#" class="dropdown-item">link 2</a>
                      <a href="#" class="dropdown-item">link 3</a>
                    </div>
 <!--** -->

<!-- Search Form - add after /ul -->
              <form class="form-inline my-2 my-lg-0">
                <input type="text" class="form-control mr-sm-2" placeholder="Search">
                <button class="btn btn-outline-success my-2 my-sm-0">Search</button>
              </form>
            </div>
          </div>
    </nav>
<!-- *** -->

<nav class="navbar navbar-expand-sm navbar-light bg-light">
        <div class="container">
          <a class="navbar-brand" href="#">Navbar</a>
          <button class="navbar-toggler" data-toggle="collapse" data-target="#navbarNav"><span class="navbar-toggler-icon"></span></button>
          <div class="collapse navbar-collapse" id="navbarNav">

              <ul class="navbar-nav ml-auto">
                  <li class="nav-item">
                      <a class="nav-link" href="#">Home</a>
                  </li>

                  <li class="nav-item">
                      <a class="nav-link" href="#">About</a>
                  </li>

                  <li class="nav-item">
                      <a class="nav-link" href="#">Services</a>
                  </li>

                  <li class="nav-item">
                      <a class="nav-link" href="#">Contact</a>
                  </li>
              </ul>

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

<!-- SIMPLE MENU W/ nav-pills & active nav -->
        <ul class="nav nav-pills">
            <li class="nav-item">
                <a class="nav-link active" href="#">Link 1</a>
            </li>

            <li class="nav-item">
                <a class="nav-link" href="#">Link 2</a>
            </li>

            <li class="nav-item">
                <a class="nav-link" href="#">Link 3</a>
            </li>

            <li class="nav-item">
                <a class="nav-link" href="#">Link 4</a>
            </li>
        </ul>

<!-- HORIZONTAL ALIGN -->
        <ul class="justify-content-center">

<!-- nav-pills -->
       <ul class="nav nav-pills">
<!--* *-->
           
            <li class="nav-item">
                <a class="nav-link active" href="#">Link 1</a>
            </li>