The author widget is located in the sidebar, in order to introduce yourself briefly.
The reward widget, AKA buy me a coffee widget, gives the readers a way to support a creator through the use of donations or tips.
social parameter is a set of key value pairs of social links that mapping from platform to their user identifier.
It supports many popular social platforms, such as Twitter, Facebook, Reddit, GitHub.
This article lists all supported platforms and how to use them.