What is normally recommended for fixing scratches[1](https://i.stack.imgur.com/PdTOm.jpg), dents, or chips[2](https://i.stack.imgur.com/uRXTq.jpg) on hardwood floors? Is there a special type of glue, caulk or epoxy out there?
[![scratch](https://i.stack.imgur.com/PdTOm.jpg)](https://i.stack.imgur.com/PdTOm.jpg)

[![chip](https://i.stack.imgur.com/uRXTq.jpg)](https://i.stack.imgur.com/uRXTq.jpg)