Got very lucky today

What about it?

I played few hundreds of games on chess.com and my rating there was around 600-700 so I believe it is true evaluation of my chess-fu right now. Recently I have tried lichess and was really really scared as they put me into 1500? rank throwing really strong players at me. As expected I got trampled and lost few games miserably but today I had this very unique experience you see here. It is my move now and when I moved my opponent has immediately resigned. Can you see what move it was?

most elite time to castle

The worst move I’ve ever seen

As white, how do you play this?

i have no idea

OH NO!!!! My Queen!!!!

What about it?

They took it

Anyone play me and give tips? I’ve always played but just for fun so I’m crap really

Does it count as smothered mate

Is there a reason why black resigned or was it for no reason?

Does it count if it's gifted? My friend has never had the chance.

I thought I had a forced mate here in the back rank, but I was wrong. Can you spot why?