How to build wall more efficient?

Hi, I’m Newbie to learn 3js. I don’t know how to choose right Geometry to build things.

【 My way】
I first trace the points to draw the geometry of the bottom surface ( p2 - green line) , then use the ExtrudeGeometry, “depth” set to the height of the building.
I think this way is too cumbersome, can anyone give me a more efficient method? Thank so much.

Take a look at this

To “Hi, I’m Newbie to learn 3js.”
Collection of examples from

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Thank you very much, the link you gave is very useful for me.