The readme keeps using the word “manage” but what does it actually do? Does it create and start new VMs? Using dockerfiles? On the local host or other hosts? I don’t understand WTF this thing does.

This part of the readme may answer your questions :

# List your VMs

flint vm list --all

# Launch a new Ubuntu VM named 'web-01'

flint launch ubuntu-24.04 --name web-01

# SSH directly into your new VM

flint ssh web-01

# Create a template from your configured VM

flint snapshot create web-01 --tag baseline-setup

# Launch a clone from your new template

flint launch --from web-01 --name web-02