This is the correct way to play against the Benko.  

this opening quickly develops the light squared bishop and if the gambit is accepted the rook's file is opened. Not to mention white's advanced pawn will turn into a target and black's queen is eyeing the a5 square.  If you really want to get better at tactical chess, try this out for black in a rapid or blitz game.  

I don't see the purpose. If it was done kingside, you would be able to open up and weaken the king's defense. Maybe I just don't like playing this opneing...

White need Nc3 and e4 to protect d5.

oh black has a great opening here! that pawn sacrifice is a great move

I dont understand what the lonely d5 is doing.

Because knight, e6 and the bishop may threat it.

Maybe it helps white to go into certain positioning. a7-f2 is not open for black?Nf3 for white has not the immidieatelly respont of black Nc6. On the other the equivalent moves for white are more open.

Nice opening.

I like how black's defense is opened up on his right, while white only has two pawns out.

nice opening

good