Here is a listing of online courses in poetry:

Advice on How to Sell Poetry
Published poet Neile Graham offers a useful basic overview of manuscript formatting, submission etiquette, and researching markets for your work.

Loft Classes
Adult, youth, and online classes given by The Loft of Minneapolis, Minnesota.

Modern & Contemporary American Poetry (Coursera)
ModPo is a fast-paced introduction to modern and contemporary US poetry, with an emphasis on experimental verse. Participants (who need no prior experience with poetry) will learn how to read poems that are supposedly “difficult.”

Minnesota Northwoods Writers Conference
An intimate lakeside setting with award-winning authors and teachers to practice the arts of poetry, fiction, and creative nonfiction. Applications and registrations are processed first-come, first-served basis. Workshops will be closed at 12 participants. A writing sample in the genre you are applying for must be submitted unless you are applying in a genre for a workshop that you’ve previously attended at the Minnesota Northwoods Writers Conference.

Modern Poetry (Open Yale Courses)
This course covers the body of modern poetry, its characteristic techniques and concerns. The authors discussed include Yeats, Eliot, Pound, Moore, Bishop, and Frost. Additional lectures on the poetry of WWI and the Harlem Renaissance.