What is the worst gambit?

Googling up opening principles and applying them is enough for you. Other than that stick to tactics/puzzle training

I think the worst gambit is the Anti Reti Gambit:
no its the kings gambit
how is this king's gambit

I need to explain this.
The worst gambit is not the king's gambit or queen's gambit. They also aren't even bad gambits. You're sacrificing a pawn to gain central control, lead in development, and also potentially get the pawn back. The worst documented gambit by far, is the Irish gambit.
If you think the Bataov gambit is worse, or the Triple Muzio gambit is worse, you should stop going to the bar, because they're by far better than this -2.6 gambit. You have to play this gambit like a Halloween gambit except your opponent isn't getting scared, you are. Now the Botez gambit isn't bad, I mean, just look at this.
The sacrifice allows such free-flowing developement, tactical and positional advantage, and maybe you can even get material. ... Just not for white.

it's sooooooooo bad
You think the Englund gambit is bad? Check this line lol.

oh and the blackburne shilling gambit is bad, as well as the wilkes-barre gambit.
The Blackburne Shilling gambit line you just showed was the worst example of black losing, partly because black actually wasn't losing. The Traxxler counterattack isn't a bad opening either.

traxxler loses by force
double muzio could be the worst opening to ever exist
It's actually not that bad and black can fall into many, many traps.
kings gambit is good you're just bad.