How many tiers of English football are there?

Related questions

1. Will Scotland leave the UK?
2. Are England and Scotland separate countries?
3. What World Cup did England not qualify for?
4. Does England use the euro?
5. Who has the most goals in soccer Messi or Ronaldo?
6. When's the last time England won the World Cup?
7. Which English football team is the most successful?
8. Who scored 5 goals in one match?
9. Is Scotland a separate country now?
10. Is Scotland bigger than England?

Tags

1. #levels
2. #estimated
3. #three
4. #number
5. #leagues
6. #right
7. #pairs
8. #eighth
9. #promotion
10. #changes
11. #football
12. #there
13. #through
14. #trying
15. #incredibly
16. #english
17. #teams
18. #relegation