The Vatican:

http://w2.vatican.va/content/vatican/en.html

The United States Conference of Catholic Bishops:

http://www.usccb.org/

The Diocese of Arlington:

http://www.arlingtondiocese.org/

The Virginia Catholic Conference:

http://www.vacatholic.org/

The Catechism of the Catholic Church:

http://www.vatican.va/archive/ENG0015/_INDEX.HTM

The Code of Canon Law:

http://www.vatican.va/archive/ENG1104/_INDEX.HTM

Mass Times in the United States:

https://masstimes.org/

Why I’m Catholic, a treasury of conversion stories:

http://www.whyimcatholic.com/

Formed, an educational site with Catholic videos:

https://formed.org/