title: What does "can only concatenate str (not "builtin_function_or_method") to str" mean?
body: <p>When I start my code it shows me an error on 6th line -> "can only concatenate str (not "builtin_function_or_method") to str".</p>
  
  <p>Could you help me to understand what is wrong? (I am a newby to coding)</p>
  
  <pre><code>firstName = input("Please, type in your name: ")
  
  firstName = firstName.capitalize
  
  print("Thank you " + firstName + " !")
  </code></pre>