Hey nostr:npub1vm7echqz9wl9hzpmsm5225x8m8ys6286y3r4f38hxtndl6gledvqassm7s , FITS stands for "Financial Independence, Time Sovereignty". It's a rebranded nuance to the common tradfi / personal finance moniker FIRE. FITS is FIRE on a bitcoin standard.

The site Svoboda linked is mine, spreading the good gospel of this idea. Hope you can get something out of it. If you're interested, I also have a simulator to figure out how you can use bitcoin to become sovereign over your time?