It is also possible to build production structures near enemy bases to more quickly get units into the fray. Protoss players can use photon cannons to apply pressure to enemy bases.
Pylon being built to warp-in units near the enemy base. Pylon in the middle of the map to warp-in units or scout for enemy advances.
Protoss players can build pylons near enemy bases or across the map to warp-in units close to the front lines.