If you're new to 3D modeling, SketchUp Free is a great tool to get started. One of the basic skills you'll need to master is rotating objects. Whether you're designing a building, creating furniture, or working on any other 3D project, knowing how to rotate objects will be essential. Here's a step-by-step guide on how to rotate an object in SketchUp Free:

1. Open your SketchUp Free project: Launch SketchUp Free and open the project in which you want to rotate an object. If you're starting a new project, create or import the object you want to work with.

2. Select the object: Use the selection tool to choose the object you want to rotate. Click on the object to select it.

3. Activate the rotate tool: In the SketchUp Free toolbar, find the 'rotate' tool. It may look like a circular arrow or a rotation symbol. Click on the tool to activate it.

4. Choose the rotation point: Click on the point where you want the object to rotate around. This point will act as the center of rotation for the object.

5. Rotate the object: Click and drag to start rotating the object. As you move the mouse, you will see the object rotating around the chosen point. Pay attention to the angle at which you rotate the object.

6. Enter specific rotation angle (optional): If you want to rotate the object at a specific angle, you can type the angle into the measurement box that appears when you start rotating the object. This allows for precise control over the rotation.

7. Finalize the rotation: Once you're satisfied with the rotation angle, release the mouse button to confirm the rotation.

8. Edit and fine-tune: After rotating the object, you may want to make additional adjustments. Use the move and scale tools to fine-tune the object's position and size as needed.

9. Save your work: Don't forget to save your project to preserve the changes you've made. It's best to save your work regularly to prevent any loss of progress.

By following these steps, you'll be able to easily rotate objects in SketchUp Free. As you practice and gain more experience, you'll become more comfortable with the software and be able to create more complex and intricate designs. Keep experimenting and learning, and you'll soon be proficient in 3D modeling with SketchUp Free.