Understanding the config
The config is pretty straightforward, there's not much to understand.
This is the database configuration. You can have either SQLite or MySQL, use mysql if you want to sync the collections data across servers.
This saves the playerdata periodically. If a player leaves the server or if the server stops, the data is saved instantly to make sure its synced on other servers when using mysql.
This is pretty self explanatory, if you don't want the plugin to work on a certain world, add them to the disabled-worlds
list and if you don't want it to work in certain worldguard regions, add those worldguard regions to disabled-worldguard-regions