The Fried Liver Attack!
the fried liver attack is a gambit and shouldn't be used as an opening
The Fried Liver is one of the most devastating lines in chess.
The Fried Liver Attack isn’t called a Gambit.
When a person sacrifices a piece for a winning attack, They don’t call it a Gambit.
They call it a mating attack.
As black I play the Petroff and Tarrasch Defense (3...c5 in the Queen's Gambit Declined, instead of 3...Nf6 or anything else). I use two repertoire books for each.
As white I play the sequence 1 d4 2 Nf3 3 g3 4 Bg2 5 0-0 6 c4 as put forth in the repertoire books Strategic Play with 1 d4 and Keep It Simple 1 d4. The sequence is not a given, it can be derailed, but that is covered in both books also.