Is knowing HTML useful?

Related questions

1. Why is HTML useful?
2. What should I learn after HTML and CSS?
3. What are advantages of HTML?
4. How is HTML parsed?
5. Why do we need HTML?
6. What is HTML rich text and plain text?
7. What is HTML used for?
8. How do HTML codes work?
9. What is the disadvantage of HTML?
10. What can HTML do?

Tags

1. #starters
2. #important
3. #without
4. #about
5. #create
6. #development
7. #language
8. #website
9. #learn
10. #browser
11. #backbone
12. #designing
13. #layout
14. #because
15. #creating
16. #markup