Can you please elaborate on these two points you bring up so I can understand a bit more fully?
On the first part, about running ads on a WordPress.com website...can I sell an e-book I wrote on a WordPress.com hosted website? The other point I don't quite get is, if I wanted to run ads on the website or if I wanted to sell an e-book I wrote, would I go to WordPress.org or somebody like GoDaddy.com to set it up? I love WordPress.com hosting but I'm wondering if ads would be beneficial and I'd like to use other plug-ins to try to boost traffic.
While on the same topic, is it permitted to have a WordPress.com website offering one's services, like a portfolio website or dating coach or tutoring website?
The other thing about the tags: I figured the more tags I used the more people would find my articles and links, since one of the tags should "hit" what they're searching for. So I guess to better grasp that I need to click on the "global tags-missing posts" link after your comment.
Thank you for your help and I'm sorry not to know more about this, but I'm still learning.