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hello everyone and welcome back in this new lesson were going to implement a very commonly asked form feature we have received several requests for this at the beginning of the recording of this course we are going to be introducing a new form control the selection drop-down but we are going to be populating it with server-side content so we are going to be adding to our form a category selection box that is going to allow us to select if the course is a beginner course an advanced course an intermediate course etc so all of those categories are going to come from a backend call the first thing that were going to do is to call the backend and retrieve the data that we need to fill in in our selection drop down so for that were going to be defining here a new observable at the level of our component that were going to call course categories this observable is going to be emitting a list of course categories lets quickly define here at the level of this component a course category