Which .hack came first?

[Gogo]

I'm wondering if anyone can give me the order in which the .hack series came out? I want to watch it from beginning to end, but I have no idea which one comes first.

Much thanks.

[Jack]

Assuming that you only mean the series and not the OAVs:

.hack//SIGN
.hack//Legend Of The Twilight
.hack//Roots

-Jack

[supersaiyu]

I thinks all of them have different story.