How can build factory?

Hi, just started playing Starcraft II. When playing humans against AI, I do not get the options to build a factory. Why not? I have barracks, so according to the Tech Tree should be ok, no?

Welcome, are you looking next to the Barracks build button by any chance? There are in fact two cards of construction options, the Factory is under “Advanced Structure”.

If this is not what’s throwing you off you might be playing a custom map, mod or Co-op commander where either the Factory genuinely is not available or the button is bugged. Make sure you are playing the “Melee” game type without mods.

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When you’re first starting out the first few maps are set to ‘simple structures only’, so no factories, starports, etc.