I'll go first. I lost about 30% so far on day trading because I kept buying into what looked like momentum, only for it to dump right after. Few weeks in and already humbled.
But I'm curious beyond just trading too. Bad timing on a swap? Got rugged? Held too long because you had no idea what was actually happening? Bought something based on pure vibes?
What happened, and looking back — what info or tool would have actually saved you?