Learning about one's faith, as well as defending it, can be a life long journey! When trying to study the Catholic faith, it can be hard to know where to start! Here are a few pages I recommend..(BTW: You can also use FORMED, which has even more! Want to use it? Send me an email at email@example.com)
LifeTeen has offered many great resources for teens and young adults for years. They have tons of prayers, blogs and videos to educate and inspire.
On this Rock: Fr. John Hollowell
Fr. John Hollowell is an awesome priest from Brazil, IN and has his own blog. He may have a post that might help you!
You'll probably come in contact with people who may not have the right view of the Catholic Church. Catholic Answers can help you have the right answers for different topics;
Ascension Presents: Fr. Mike Schmitz
If you haven't heard of Fr. Mike Schmitz, you need to check him out! He is one of the coolest priests out there who covers different topics every week.