How many types of backlinks are there in SEO?

Related questions

1. What is DA in SEO?
2. What does Ahrefs domain rank mean?
3. Do backlinks still work 2018?
4. What is Ahrefs used for?
5. Do nofollow links have any value?
6. What domain authority is good?
7. Are Backlinks still important 2018?
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9. What is URL example?
10. Why is nofollow important?

Tags

1. #backlinks
2. #effective
3. #trusted
4. #pages
5. #therefore
6. #serps
7. #engines
8. #search
9. #worthy
10. #engine
11. #results
12. #acquiring
13. #types
14. #links
15. #essential
16. #recognized