PvT: fast dt.
make common 8 probe pylon, vespen, cybernetic core.
The sense is that u have to do scout with 2 probes. I prefer go scout by 8th and 10th probes. That probe which didn't find terran, makes a hidden pylon, where it later makes citadel and archives. I also add 2 more gates at main to get 3 of them. Tips (All in this stategy depends on your sense of game):
1. Terran can understand what u plan to do if he doesn't see your goon-range grading.
2. If u see 1-2 marines at terran main, it can be worth making 1 zealot to haras him a bit.
3. Depending on the situation make 1-2 goons and go haras terran.
4. If you see terran's wall, don't fail, cause 3 dts break suply and scv can't fix it.
5. From 3 gates u have not stop dt, so u can fear no mines, also u can break a turret with mass darks if terran goes FE through 1fact-tanks-turrets.
Practice and u'll do. I've killed many terrans like this from 3D, Ever-clan, nV and many other teams.