The Catechism of the Episcopal Church in the USA summarizes the faith in question-and-answer format. The ecumenical creeds, both Nicene and Apostles, are used by the Anglican Communion in its worship day by day and week by week. They are ancient and universal statements of Christian faith.
In addition, many Anglican churches follow ancient tradition and include the Athanasian Creed among their statements of faith.
The Diocese of Texas offers an 'Anglican primer' online, and you might like to look at the sections on:
This latter section ('being Episcopalian') is directed particularly to people in the USA wondering about the Episcopal Church.
Another very important ancient statement of faith is the Chalcedonian formula, which defined the limits of Christological Orthodoxy.
The Chicago-Lambeth Quadrilateral describes the general ecumenical principles of Anglicans.
The Thirty-Nine Articles were important at the Reformation, but are less so today.
The BBC World Service has produced a Basic Christianity web page that is well done, if not specifically Anglican.
A Beginner's Guide to the Anglican Church (also on this website.

