problem with exporting the model from blender to unity

[Pawel_Lemiech]

Hello everyone, I’m a beginner in Unity and Blender but I got curious and I’ve been learning these two programs for some time, I decided to make my own models in Blender, unfortunately when yesterday I tried to export the model to the fbx format and open it in Unity I saw some deficiencies in the model, half I tried to find something on the Internet last night, but I couldn’t.
I’m counting on your help
I am attaching two photos of what the model should look like and what it looks like.
Thank you in advance and best regards to everyone.

[Okidoki]

Welcome …

In Blender:
Edit mode: Mesh → Normals → Recalculate Outside/Inside

Check via: Overlays → Face Orientation (top right circle/disc icon) everthing should turn blue; no red

[Pawel_Lemiech]

Thank you for your help, everything is as it should be