YouTube has a lot of information on your video and its performance that you can use to learn about your market, including demographic info, location, popularity, and keyword suggestions.
You can see where in the world people are viewing your video (Insight), and they are viewing it (Hot Spots). You can update and add more text, change the titles, add more keywords and change the video thumbnail.
You can also update and customize your Channel page. Everyone who has a YouTube account has a Channel page that is like a home for your videos. It includes sections for contact info, description area, places to put web links, all kinds of stuff. You can also customize the look, adding in logos or artwork to extend your brand.
All of this is located inside of your account once you log in and it is well worth reviewing and tweaking.