How do you lock an object in your Illustrator document?

To lock an object in your Illustrator document, selecting it and choosing Object > Lock > Selection is the correct method. This action effectively prevents any further modifications to that specific object, ensuring that you can work on other elements in your design without accidentally moving or editing the locked item. Locking an object is a vital technique in Illustrator, particularly when you're dealing with complex layouts, as it provides a safeguard against accidental adjustments during the design process.

While other methods for locking objects may exist, such as right-clicking and selecting Lock or using keyboard shortcuts, these options do not always provide the clarity or control that the menu selection offers, especially for users who prefer a more visual approach. Moreover, dragging an object to a "Locked folder" is not a feature found in Illustrator; it reflects a misunderstanding of how locking mechanisms work within the application. Thus, the menu-driven option is the most reliable and straightforward way to achieve this task.