I wanted to share another method I found for the bottom part of the stairway, as I wanted to have it aligned perfectly
So what I did to align the bottom segment is:
1.
Select faces and extrude in place (e + esc)
Select this edge, and move it down in z axis, snapping to the opposite edge of the Pyramid β it will snap to 0z (there are a lot of edges you can snap to, but I think it cant be adjacent edge to what we are moving, as it creates some strange sort of effects - it basically spins the edge around z)
Go to vertex mode, snap to highlighted edge and move in x axis. Repeat this step for other 3 verts left
It aligns perfectly but requires some work with single verts.
OR
3B.
You can replace last step with edge select, move along x axis and snap to that rail edge β you just canβt snap to the last segment of the rail, you need to snap to the higher one. (same situation as with the first snapping.)
In the end - remove doubles (or merge by distance to be precise ). Or you can slide the repeating edge to the middle of bottom face to have the same topology as we have it in the course.