WordPress comes with lot of inbuilt features ( API ) (https://codex.wordpress.org/WordPress_APIs). These features allows to extend the WordPress based applications, easy and proper way.
in this meetup we are going to talk about
• WordPress Short-code API (https://codex.wordpress.org/Shortcode_API)
• Meta Data API (https://codex.wordpress.org/Metadata_API)
how we can use above API's to extend WordPress Theme's functionalities