A good hook for an essay would be an interesting quote. A good quote to use is one said by a highly reputable person, and it should be relevant to the topic of the essay.
The quote being used as a hook for the essay should be found at the beginning of the composition. A good quote rouses the interest of readers enough to make them keep on reading the essay. Another interesting hook to use would be a trivia. A fun fact beginning an essay is effective to pique the readers' curiosity to make them want to read everything.