Here’s a quick lowdown of the early-game cannon rush:
- Build a Probe and make it gather minerals.
- Build another Probe as the first finishes.
- As the second probe finishes, build a Pylon next to your Nexus and rush out to the enemy base with the Probe. I usually hotkey the Probe 1, and the Nexus 2.
- Depending on the size of the map, you can either warp in another Probe while you traverse the map or save the minerals. You should probably build a Probe on the larger maps. If you do, use a Chrono Boost on the Nexus to pump it out faster.