Before using fundamentals you need to use the init command to generate a user settings file. Running the following creates a yaml settings file in your home folder under ~/.config/fundamentals/fundamentals.yaml:

fundamentals init

The file is initially populated with fundamentals’ default settings which can be adjusted to your preference.

If at any point the user settings file becomes corrupted or you just want to start afresh, simply trash the fundamentals.yaml file and rerun fundamentals init.