Blender to Unity FBX Export. Nightmare for anyone else?

I'm an amateur when it comes to blender, but it seems that exporting meshes and armatures with animations to Unity as an FBX is a nightmare for some others as well.

Most posts I've reviewed are older though, so I'm hoping that this can become a modern post that can help me learn, and others. For context, I am using Blender 5.0 and Unity 6.2

My understanding currently:

Unity uses a left-handed coordinate system.|
Up is +Y,
forward is +Z,
right is +X.

If you point your left thumb along +X (right) and your left index finger along +Y (up), your left middle finger points in the +Z (forward) direction, which matches Unity’s axes.

Blender uses a right-handed coordinate system.
Up is +Z,
forward is −Y,
and right is +X.

If you point your right thumb along +X (right) and your right index finger along +Y (forward), and your right middle finger will then point along +Z (up).

Now, I've come across a myriad of issues when exporting. A lot of difference sources are saying these are things to check:

1. Bone Rotations
2. Applying rotations and transforms
3. Setting origins to center mass
4. Setting origins to world grid
5. Apply transforms in the export settings
6. Don't apply transforms in the export settings

And yeah, the list goes on.

I think the main issue I've seen online, and experienced myself, is that meshes and bones have rotations applied at a 90 degree angle, or a -90 degree angle, or even an 89.00 degree angle.

Or if you have separated meshes, transforms/rotations apply correctly to one and not the other.

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Things I've tried:

1. Addons
2. Bake axis conversion in Unity
3. Physically rotating the mesh/armatures in blender before exporting
4. Recalculating bone roll
5. Setting Origins to every possible option that makes sense before exporting
6. YouTube videos.

https://www.youtube.com/watch?v=-QARA\_JjbUs&list=LL&index=1&t=747s
This guy was super helpful in explaining things, but at the same time didn't resolve all of my issues. Just helped with knowledge.


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Last thing to note...

I have been successful in actually getting an export where everything is as it should be, and animations look good and all. I just don't know why or how.

With that said, is there anyone with the knowledge and willingness to share a 'definitive' method of exporting a FBX to Unity?



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Mouse click on object

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I've added object, added box collider 2d, added noscript as in tutorials, attached it to the object. And it doesn't work. I tried all way, all possible ways. Can someone help please? It's a very very simple thing but I cannot do this.

using UnityEngine;


public class Click : MonoBehaviour
{
    void OnMouseDown()
    {
        Debug.Log("+");
    }
}

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