Answer: No. Tagging pages to a dynamic list is not required. You should only tag pages under a dynamic list if you want it to display as a result item for that list.

Answer: Dynamic List titles can be changed, but only by System Administrators.

Answer: Yes. Content pages can be tagged under one or more Dynamic lists.

Answer: Yes. Just select the dynamic list name from the box on the right and click the bottom arrow (in-between the boxes) to remove that list.

Answer: This will allow the content page you created to show up on your website under the dynamic list(s) you tagged it to. For example, if your page contained information for a particular visitor and there was a dynamic list created to display all pages, document files, etc. for that visitor, you would tag your page to that list to include it.