Can someone explain Competitive for me?

I noticed that I literally only went up, never lost mmr while playing ranked. How do you even lost ranks in Infinite?

Im in the same boat can hardly call it ranked

you can lose your Onyx, but I think that’s it. The idea is that until you’re Onyx, it’s just junior varsity

Lose a match while also getting hard stomped individually and you might lose 1/20th of your progress.