Hi guys.
When I scale the extrusion of the edge, in the part behind, something go wrong.
What may have happened?
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Welcome to this site.
Take some time to look around and take part.
It just looks like you selected too much. Only select the front step top corners, then move backwards on X.
Thank you! 
And what a speed answer, appreciate that.
Maybe, I didn’t catch your advice.
But even if i move only one step of my ramp, in the opposite side seems that the cube is linked to my extrusion.
I think that when I take the Subsdivison lesson, I have messed up something.
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Go to wireframe and see if you have somehow created internal geometry connections. Delete them if so.
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Do you use a mirror modifier?
Did you use X-Ray when selecting edges?
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