jQuery Event handling
Event-based design patterns are very common in modern applications, especially in the development of user interfaces.
Forms provide a method of grouping inputs and collecting user data. As such they are an important design constructor for all developers and designers to be familiar with.
Selectors are a programming pattern that can be used to select an element from a container. They are primarily used in technologies such as CSS and JQuery to apply styles to groups of elements.
Public questions (free account) are common interview questions. They are great for practicing, or if you want to filter candidates using the classic problems.