9. Should I use hidden text on my website to help rank better? 10. Will using dynamic pages harm my rankings? 11. Do filenames and directory structure matter? 12. What is a "reciprocal link"? 13. What is "PageRank (PR)"? 14. What does "cross linking" mean? 15. What are "inbound links"? 16. How can I find how many inbound links I have?