How do I rotate an object around another object in Blender?

To rotate an object around another object in Blender, you can parent the object you want to rotate to the object you want to rotate around.

Here's how:

1. Select the object you want to rotate. This will be the child object.
2. Shift-select the object you want to rotate around. This will be the parent object. Ensure the parent object is highlighted in a different color (often yellow) indicating it is the active selection.
3. Press Ctrl + P. This will bring up the "Set Parent To" menu.
4. Choose "Object (Keep Transform)". This option parents the objects, ensuring that the child object maintains its current position relative to the world origin. If you choose "Object", the child object will jump to the parent's location. "Object (Keep Transform)" ensures a smoother transition.

Now, when you rotate the parent object, the child object will rotate around it. You can rotate the parent object using the R key, then specifying an axis (X, Y, or Z) and an angle.