If you want to rotate an object in SketchUp Free, the process is quite simple. Here are the steps to rotate an object in SketchUp Free:

1. Select the object you want to rotate: Use the Select tool to choose the object you want to rotate.

2. Activate the Rotate tool: Click on the Rotate tool in the toolbar or press the Q key on your keyboard to activate the tool.

3. Choose the rotation point: Click once to set the rotation point. This is the point around which the object will rotate.

4. Rotate the object: Click again to set the rotation axis, then move the mouse to rotate the object to the desired angle.

5. Complete the rotation: Once you've achieved the desired rotation, click to complete the action.

It's important to note that you can also use the keyboard to specify the precise angle of rotation. After activating the Rotate tool, simply type in the desired angle (e.g., 45 degrees) and press Enter.

Additionally, SketchUp Free allows you to enter specific constraints while rotating an object. For example, you can rotate an object strictly on the blue axis by pressing the arrow key corresponding to the blue axis (up arrow for blue, right arrow for red, and left arrow for green) after selecting the rotation point.

Once you've familiarized yourself with the basic rotation process, you can experiment with more advanced techniques, such as rotating multiple objects at once or using the Rotate tool in combination with other tools to achieve complex transformations.

In conclusion, rotating an object in SketchUp Free is a straightforward process that can be easily accomplished with the Rotate tool. By mastering this essential skill, you'll be able to manipulate objects and create dynamic 3D models with precision and ease.