Here are some great resources for Catholic teaching online:

The United States Conference of Catholic Bishops:  www.usccb.org

America Magazine, National Catholic Weekly:  www.americamagazine.org

Orlando Diocese:  www.orlandodiocese.org 

www.catholicnews.com

www.catholic-extension.org

catholicmoms.com

www.dads.org 

www.catholicweb.com

www.vatican.va

www.textweek.com

www.christusrex.org

www.shc.edu/theolibrary

www.kids4truth.com

www.scborromeo.org

www.usccb.org/prayer-and-worship/roman-missal/index.cfm

www.usccb.org/beliefs-and-teachings/what-we-believe/catechism/

www.catholicanswers.com

www.catholichistory.net

www.ewtn.com