You can try using the same products that you use to smooth the furniture up. This way, you can avoid using abrasive materials like sandpaper or a pumice stone because they may damage the furniture. One solution for furniture with sharp edges is to purchase a pre-punched hole and drill the hole with a circular saw.
What can I use to cover sharp corners?
https://www.youtube.com/watch?v=YKMPGTkeKuc
How do I protect the edges of my desk?
Desk edging, made from plastic, foam or metal, protects the front edge of the desk from harm. Some foam versions are also designed to prevent injury and may include an ergonomic wrist rest. Such edging may be installed with double-sided removable tape or with a durable adhesive for a more permanent solution.