Rotate around the x/y/z axis while keeping its angle?

[doot56]

// Rotate 'transform' around the y-axis by 360 degrees in 1 second 
Tween.EulerAngles(transform, startValue: Vector3.zero, endValue: new Vector3(0, 360), duration: 1);

I tried with a cube Tween.EulerAngles(transform, startValue: new Vector3(-20, 0), endValue: new Vector3(-20, 360), duration: 1);
But the whole thing starts rotating. I want to rotate only the y while its rotating and keeping its angle so I can see the top of the cube the whole time kind of like facing me.

[KyryloKuzyk]

Try this:

1. Create a new empty object with rotation (20,0).
2. Make this cube a child of that empty object.
3. Rotate the cube with Tween.LocalEulerAngles().