How do I know if fastboot is working?

Related questions

1. What does fastboot oem unlock do?
2. Can I root without unlocking bootloader?
3. What is Enable OEM unlock?
4. What is OEM on a phone?
5. Are unlocked phones rooted?
6. Does rooting a phone delete data?
7. Is rooting and unlocking bootloader the same?
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Tags

1. #prompt
2. #fastboot
3. #terminal
4. #properly
5. #cable
6. #working
7. #device
8. #number
9. #computer
10. #connect
11. #command
12. #using
13. #listed
14. #serial
15. #following