You have a syntax problem. Try this instead:
<%= link_to "Learn More", {controller: "menus", action: "index"}, class: "btn btn-inverse" %>
Some documentation for you to go further with the link_to Helper
They say:
Be careful when using the older argument style, as an extra literal hash is needed:
link_to "Articles", { :controller => "articles" }, :id => "news", :class => "article" # => <a href="https://stackoverflow.com/articles" class="article" id="news">Articles</a>Leaving the hash off gives the wrong link:
link_to "WRONG!", :controller => "articles", :id => "news", :class => "article" # => <a href="https://stackoverflow.com/articles/index/news?class=article">WRONG!</a>
I recommend you to use the URL helper generated following your routes configuration. In your case:
link_to "Learn More", menus_path, :class => "btn btn-inverse"
A little reminder on the Helpers generated:
# routes.rb
resources :users
# any view/controller
users_path #=> /users
edit_user_path(user) #=> /users/:id/edit
user_path(user) #=> /users/:id (show action)
new_user_path(user) #=> /users/new