Hopkins being difficult to read, this edition with very insightful introduction and notes by 20th century English poet James Reeves is about as good as it gets.
That said, most of Hopkins’ poetry is uninteresting in content except to a religious person, or to a person interested in poetic technique and the elasticity of the English language. His ‘sprung rhythm’ work and his use of alliteration and assonance draw on Anglo-Saxon rather than Norman French roots, though he frequently uses the sonnet and other rigid structures. His phrasing of his thoughts, however, is idiosyncratic and often dense to the point of unreadability.
His best-known poems date mostly to 1877, when he suddenly felt free to express an ecstatic joy in nature – God’s Grandeur, Pied Beauty, and The Windhover. Spring and Fall (“Margaret, are you grieving / Over Goldengrove unleaving?”) dates from 1880, As Kingfishers Catch Fire a year or two later. Living an isolated and unappreciated and religiously constrained life, his health and emotional balance became ever weaker and his poetry ever bleaker. His last two completed poems, Thou art indeed just, Lord, and To R. B. (Robert Bridges), were written in despair shortly before his death in 1889 at age 44.
His output was not extensive, but half a dozen of his poems posthumously charged and changed English verse forever.