The most aggressive first move of white is 1.e4. If Blacks don't know what to do exactly against it, then they will face many problems…
Sicilian Defense is the most aggressive and the most popular opening choise against the first move 1.e4. If you would like to improve your chess then you should know how to deal with it.
At some point in time, all chess players were amateurs to understand that whenever a grandmasters level player makes a move, they are playing every move after winning and losing so many games.
The traxler counter-attack is the most popular defensive opening, also it is one of the best combative openings for the black while the white is okay with playing the Italian game.