This is a little vague. There are many topics in The Bible that are relevant to teens. If you post more information about why you are asking, I can answer more specifically, but a good starting point for a young teen is to read the book of Proverbs. It's full of wisdom for young people starting out in life.
MIDOL for teens is definitely the best if your under 18, if not then take the regular but for teens its stronger because girls have issues with it alot more when they are young, YOURWELCOME
Investopedia and Money Magazine both have retirement calculators geared toward teens and young adults to get them started saving young. The calculators show them how a long horizon and compounding will help them save enough.
Young Explorers http://www.youngexplorers.com/ usually has a great selection of creative educational games and toys for children, from babies on up to teens.
Flyff is probably the best one out there. Wizard101 is pretty good, too. I highly recOmand flyff as wizard101 is pricey and a bit young for teens those ages.
the best topic in is wedding becuase it is interesting
teens shouldnt use pacifiers unless they are braindead
Scallyroo.com is the best website for teens in my opinion. It is safe and has some really unique tools perfect for young people. Members can shop, meet other teens, rate products, set goals and get rewarded for completing them. It is really awesome!
The best room decor in terms of flooring for teens is lovely pink.
Ludo and Chess are the best board games for teens.
leon
I think the best topic is the library system :)
Franklin