Dei Verbum (The Word of God) on Divine Revelation was, together with the other Dogmatic Constitution, Lumen Gentium (Light of the Nations) on the Church, the most important document of the Second Vatican Council.
This is an easy-to-follow commentary on Dei Verbum paragraph by paragraph by Canon John Redford, who has lectured and written on the subject of divine revelation to hundreds of future priests and to lay people since a few years after Dei Verbum was promulgated in 1965.