How do I edit a conf file in Ubuntu terminal?

Related questions

1. How do I exit text editor in Terminal?
2. What text editor comes with Ubuntu?
3. What is the default text editor for Ubuntu?
4. How do I edit a file in Terminal?
5. Why can't I edit a PDF file?
6. What software can edit PDF files?
7. What is nano text editor?
8. What is the default text editor for Linux?
9. Can you fill in a PDF form on iPad?
10. How do I edit a .bat file?

Tags

1. #window
2. #replace
3. #where
4. #placed
5. #pressing
6. #configuration
7. #actual
8. #followed
9. #directory
10. #terminal
11. #simply
12. #navigate
13. #filename
14. #combinations
15. #config