I can also recommend Beyond all Reason.
If you ever played Supreme Commander, this game is like a sequel.
It also has an active YouTube streaming community with tutorials and ingame are some scenarios to teach you about the various units and strategies.
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Beyond All Reason is really cool! Had a lot of fun with it wrestling with the AI and teaming up with my friends.
It’s scratching that Starcraft itch while I tap my fingers waiting for Microsoft to kick Bobby Kotick out of Activision-Blizzard lol.
I can also recommend Beyond all Reason. If you ever played Supreme Commander, this game is like a sequel. It also has an active YouTube streaming community with tutorials and ingame are some scenarios to teach you about the various units and strategies.