Problem when exporting from Blender 2.8 to Unity, how to fix?

Question

Unity

I'm trying to export a model from Blender to Unity.
It doesn't work( When opening the model in Unity, it is all crooked. Eyes stick out, ears and hair can be seen through the head.
It looks like this -

How to fix it?
Thanks in advance)

Answer 1

If anyone has the same problem:
In Edit Mode, turn on the display of normals.
If some of the normals look inward, then you need to flip them.
Select the whole model in Edit Mode and click Mesh => Normals => RecalculateOutside.
Then save and re-export.