What are some common troubleshooting steps for addressing Nikon D7100 focus issues?

Some common troubleshooting steps for addressing Nikon D7100 focus issues include checking the lens for dirt or smudges, ensuring the lens is securely attached, adjusting the focus mode and settings, cleaning the camera's autofocus sensors, and updating the camera's firmware. If issues persist, contacting Nikon customer support or a professional camera technician may be necessary.