Introduction

• Core components of Angular
• Templates
• Templates with directives are used to create components.
• Directive
• Used to add custom behavior to our application and they can be extended too.
• Components
• Components form building blocks of our application
• Components can be defined with custom behavior and Template
• We create components in isolation and each component has isolated behavior.
• Each component has other components in them.
• This is called as nesting.
• We can also have directives inside components.
• To transform data we use Pipes.
• Mostly used in templates but can be used in components.
• Http module is used to get data from the server.
• From Http module data is passed to services which is then transferred to components. 
• Services provide data to our components.
• We manipulate data using services.
• Router is used to route components to url.
• Router is responsible for mapping different components to different routes.
• Application Testing and State management are used to test and manage states.