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

<header>
  <nav class="navbar navbar-expand-lg navbar-light bg-primary">
    <a class="navbar-brand" href="<%= root_path %>">
      <%= image_tag("logo.png") %> The only movies that actually matter
    </a>
    <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarNav" aria-controls="navbarNav" aria-expanded="false" aria-label="Toggle navigation">
      <span class="navbar-toggler-icon"></span>
    </button>
    <div class="collapse navbar-collapse" id="navbarNav">
      <ul class="navbar-nav mr-auto">
        <li class="nav-item">
          <%= link_to "All Movies", movies_path, class: "nav-link" %>
        </li>
      </ul>
      <ul class="navbar-nav">
        <% if current_user %>
        <li class="nav-item">
          <%= link_to current_user.name, current_user %>
        </li>
        <li>
          <%= link_to "Sign Out", session_path,
                       data: { turbo_method: :delete },
                       class: "button" %>
        </li>
        <% else %>
        <li class="nav-item">
          <%= link_to "Sign In", new_session_path, class: "nav-link" %>
        </li>
        <li class="nav-item">
          <%= link_to "Sign Up", signup_path, class: "nav-link" %>
        </li>
        <% end %>
      </ul>
    </div>
  </nav>
</header>