diff --git a/frontend/angularjs.js b/frontend/angularjs.js
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+/* *******************************************************************************************
+ * ANGULARJS CHEATSHEET
+ * API DOCUMENTATION: https://docs.angularjs.org/api
+ * DEVELOPER GUIDE: https://docs.angularjs.org/guide
+ * ERROR REFERENCE: https://docs.angularjs.org/error
+ * ******************************************************************************************* */
+
+
+/* *******************************************************************************************
+ * TIPS & TRICKS
+ * ******************************************************************************************* */
+
+
+// You can retrieve a scope for any DOM element by using:
+angular.element(aDomElement).scope()
+
+
+/* *******************************************************************************************
+ * CSS CLASS USED BY ANGULAR
+ * ******************************************************************************************* */
+
+
+ng-scope                  // AngularJS applies this class to any element for which a new scope is defined
+ng-isolate-scope          // AngularJS applies this class to any element for which a new isolate scope is defined.
+ng-binding                // AngularJS applies this class to any element that is attached to a data binding, via ng-bind or {{}} curly braces, for example.
+ng-invalid, ng-valid      // AngularJS applies this class to a form control widget element if that element's input does not pass validation.
+ng-pristine, ng-dirty     // AngularJS ngModel directive applies ng-pristine class to a new form control widget which did not have user interaction. Once the user interacts with the form control, the class is changed to ng-dirty.
+ng-touched, ng-untouched  // AngularJS ngModel directive applies ng-untouched class to a new form control widget which has not been blurred. Once the user blurs the form control, the class is changed to ng-touched.