John Keats - Poetry Foundation
https://www.poetryfoundation.org/poets/john-keats
Keats' author page on Poetry Foundation, where many of his poems, essays on his work, and audio recordings may be found.
John Keats 101 - Poetry Foundation
https://www.poetryfoundation.org/articles/147110/john-keats-101
This essay by Benjamin Voigt offers a brief insight into each of Keats' major poems, beginning with "On First Looking Into Chapman's Homer" and ending with "Bright star."
Keats on the Joy of Singledom and How Soltiude Opens Our Creative Channels to Truth and Beauty
https://www.brainpickings.org/2016/02/01/keats-letters-solitude/
Maria Popova collects some selections from Keats' writing on solitude, creativity, and beauty, all written before the death of his brother Tom in 1818.
John Keats and 'negative capability' - The British Library
https://www.bl.uk/romantics-and-victorians/articles/john-keats-and-negative-capability
An essay published on the British Library's website that explains Keats' notion of 'negative capability.'
Manuscript of "To Autumn" by John Keats - The British LIbrary
https://www.bl.uk/collection-items/manuscript-of-to-autumn-by-john-keats
A copy of the manuscript of "To Autumn," along with the context of its composition in Keats' life.