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The other thing is that if you're going to make an engine focused on rts games, you should probably study an existing RTS-focused engine. For example, here's the source code for Spring. Learn what it does, why, and how. You might decide this is good enough for what you want to do. You might decide this is pretty close, and you'll only want to extend it rather than start from scratch. You might decide to still start from scratch, but at least you learned something about requirements/ methods/ etc.
So my recommendation is just to spin up a graphics context in whatever API you're interested in (or go to https://learnopengl.com/ if you have no preference/prior experience) and just start writing.
You actually need to follow these steps to be able to access UE source code, otherwise the GitHub page of UE Source Code will give you a 404.
Godot Engine source code is there too, and that's accessible right off the bat.
You're missing one big one which I think is perhaps the best codebase to look through for someone interested in engine infrastructure: https://github.com/id-Software/DOOM