Hey there,
There are a lot of objects in this scene. What specifically are you referring to? The building? The trees? The specific wavy roof of the building?
hello sorry the wavy roof of the
building
It’s pretty simple, just give a cube a few loop cuts, turn on Proportional Editing with O, grab some bottom faces (one at a time) and move them up and down
Please there is no way to get is smooth and non destructive ?
There’s a lot of different ways to get what you’re looking for. I just showed you a quick and simple way. Depending on your skill level, that changes your options. What I would actually do is use the edges of a plane, randomize the transform, smooth and subdivide, extrude upwards, make a cube in the middle slightly smaller, and boolean it out… but I’m not sure that means much here 
what’s your skill level?
or alternatively a non destructive approach with nurbs, imo that shape is a bit tricky in terms of it’s orientation i.e. concave indents aligned to multiple axis.
Intermediate I gess
I understand fundemental
Thanks you this is the method I’am using but dont get it right
Can you be specific, what’s the issue?
I dont know How to make the Wood panel to follow a curved shape
Dont get it right even using follow curve
Whether you’re referring to either the horizontal or vertical plane…duplicate your primary shape then add sufficient points or shrink wrap for accuracy.
As @josephhansen mentioned above, various avenues available to take advantage of merely just a straightforward instance of implementing a given workflow dependent upon your particular use case.
Okay thanks you