Top 10 things to know about Eastern Orthodox

1. INTRODUCTION - Introduces the non Orthodox to Orthodox Christianity.
2. HOUSE OF GOD - Describes the interior of the church building.
3. WORSHIP - Discusses the form and characteristics of Orthodox worship.
4. LITURGY - Describes the meaning and celebration of the Eucharist.
5. SACRAMENTS - Describes the meaning and importance of liturgical life.
6. SPECIAL SERVICES AND BLESSINGS - Describes the non-sacramental services which contribute to spiritual life.
7. TEACHINGS - Outlines the salient points of doctrine and basic credal affirmations.
8. SPIRITUALITY - Discusses the meaning of theosis as the goal of Christian life.
9. HISTORY - Sketches the great epochs of Orthodoxy.
10. THE CHURCH - Outlines the procedure for becoming a member of the Orthodox Church

(http://www.goarch.org/en/ourfaith/articles/article7102.asp)