[breadfan]

I'm still a low league player. I check for the basics when scouting - worker shortage on the mineral line, how many gas and how much has been harvested, various building spotting and I'm getting the hang of some early building timings. While I'm OK scouting Terran (it's what I know), often I'll be surprised by the others, either by the appearance of some unit I wasn't expecting, or equally by a unit not appearing when I expect it to (especially when I invest in some hard counter unit and find myself at a disadvantage as a result).

What's the best approach to learn all the variations to look for? Should I continue watching replays and listening to streamers/casts explain what they're doing? Should I try out the other races more seriously to learn the tech trees and common build orders? Should I just forget about focusing on it altogether and let it come naturally?