A plugin in a command or a set of commands
Almost all (if not all) the plugins that do not require configuration are already enabled.
If you want some extra features open plugins_deactivate, and read the README.md inside the plugin you want to enable and install the depencies.
When you have installed all the things needed and changed configurations (if needed), move the folder from plugins_deactivated to plugins, then restart the userbot and you are done!
Move the directory from plugins to plugins_deactivated