title: What happen when removing resources from terraform configuration file
body: <p>I am trying to find my way in terraform , i am going through the documentation and got confused about what is exactly will happen if a resource has been deleted manually from the configuration file then we ran the apply command on the modified configuration file please ?
  my understanding that the state file will still have the deleted resource as well it will still be actually running on the cloud platform so terraform apply will not perform any action, but i am not sure.
  Appreciate if you help to clear my understanding please
  Also another relevant point please what if a resource was changed manually from the cloud console for example and we tried to do any action from terraform on that resouces , what will happen ?</p>
  <p>Thanks a lot ,</p>