today_ai_weather/app/views/layouts/_header.html.erb

<header class="navbar navbar-fixed-top navbar-inverse">
  <div class="container">
    <%= link_to "sample app", root_url, id: "logo" %>
    <nav>
      <ul class="nav navbar-nav navbar-right">
        <li><%= link_to "Home", root_url %></li>
        <li><%= link_to "Help", help_url %></li>
        <li><%= link_to "Login in", '#' %></li>
      </ul>
    </nav>
  </div>

</header>