[mGGAequitas]

so to ffe

9 pylon - scout here, this scout is for scouting early pools if early pool go forge -> cannon obviously
if standard pool 17 nexus 17 forge 17 pylon 18 gate 18 cannon

Then to see if he is going to be agressive with roach/bane you have to scout to see if and when he takes a third, if you doesn't take a third it's likely to be roach or bane so make a few more cannons and some sentries.

If they tech to mutas it will most likely be on 3+ bases otherwise they just wont have many and a cannon in mineral lines will suffice. If they are getting a lot of mutas on 3 or more bases you will need a fair few cannons in mineral lines, blink, and tech up to storm, and just defend your three bases without losing too many units.
To scout for mass mutas you can check the gas of his third, he will need all 6 gases to be able to make mutas in any scary amount, so just fly ur observer over the third, also you can tell if he stays on lair for a long time (could also be infestor).

Quick Comments

ProAnnn:

tsk. Teaching low level players nexus first. They dont know how react properly tbh :D