It has been a few years for me, but there were several prescient chapters when I last ready it during the rise of populism around the globe (2015), namely sections IV, V, VI, and VII:
Foreword
I Over-Population
II Quantity, Quality, Morality
III Over-Organization
IV Propaganda in a Democratic Society
V Propaganda Under a Dictatorship
VI The Arts of Selling
VII Brainwashing
VIII Chemical Persuasion
IX Subconscious Persuasion
X Hypnopaedia
XI Education for Freedom
XII What Can Be Done?
Would recommend the read to anyone that found 1984, BNW, F451, etc. interesting.[0] https://www.huxley.net/bnw-revisited/ (full text)
Edit: formatting