nav varのテンプレート

    <nav class="navbar navbar-expand-sm navbar-dark bg-dark">
        <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarNav4"
                aria-controls="navbarNav4" aria-expanded="false" aria-label="Toggle navigation">
            <span class="navbar-toggler-icon"></span>
        </button>
        <a class="navbar-brand font-weight-bold" href="#">あ</a>
        <div class="collapse navbar-collapse">
            <ul class="navbar-nav">
                <li class="nav-item active">
                    <a class="nav-link" href="#">い</a>
                </li>
                <li class="nav-item">
                    <a class="nav-link" href="#">う</a>
                </li>
                <li class="nav-item">
                    <a class="nav-link" href="#">え</a>
                </li>
            </ul>
//右寄せしたい部分だけulを分けて、ml-autoを追加する
            <ul class="navbar-nav ml-auto">
                <li class="nav-item">
                    <button type="button" class="btn btn-outline-light">ログアウト</button>
                </li>
            </ul>
        </div>
    </nav>

#改訂版

レスポンシブルに対応

    <nav class="navbar navbar-expand-md navbar-dark bg-dark">
        <a class="navbar-brand text-white">グローバルメニュー</a>
        <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarNav4"
                aria-controls="navbarNav4" aria-expanded="false" aria-label="Toggle navigation">
            <span class="navbar-toggler-icon"></span>
        </button>
        <div class="collapse navbar-collapse" id="navbarNav4">
            <ul class="navbar-nav mr-auto">
                <li class="nav-item active">
                    <a class="nav-link">a</a>
                </li>
                <li class="nav-item">
                    <a class="nav-link">b</a>
                </li>
                <li class="nav-item">
                    <a class="nav-link">c</a>
                </li>
            </ul>
        </div>
    </nav>