against the benoni , the best way is to push d5 and e4 then develop the knight to f3 , the dark square bishop to f4 to always put pressure on the d6 pawn ,
black can try to play a6 and b5 , the moment u see a6 play a4 ,
here are couple of games to help
https://www.chess.com/game/live/83906395755
https://www.chess.com/game/live/83528206525
also don't stress urself on what do specifically against each opening , just try to apply opening principles and u'll be fine
The old benoni defense is just a reverse englund gambit NOW WHAT