Building a fairly complex web application needs a very careful planning. Not just at the application level, but also at maintainability and efficiency level. Even if you are going to be the only person that’s going to work and maintain the code for a foreseeable future. Here are 9 things I thought you should know after creating your Hello World application and before creating your next application using Ember, especially if you are going to use Ember Data as your persistence library. Due to readers request, here is the code.