Here is a summary of the preface to the Lyrical Ballads in 500 words:
Wordsworth's preface to the Lyrical Ballads is an introduction to his poetry collection, as well as a manifesto for the Romantic movement in England. He explains that he and his friend Coleridge composed the poems as an experiment to test the public reception of poems that use "the real language of men in a state of vivid sensation." He claims that his poems are different from the poems of his age, which are artificial and conventional, and that he wants to return poetic diction to the natural and spontaneous expression of human emotions.
Wordsworth also outlines his principles for the composition of lyrical ballads, which he defines as "the spontaneous overflow of powerful feelings" that are recollected in tranquility by the poet. He argues that poetry, though passionate, should still be the product of prior thought and acquired skill. He believes that a worthy poet must be able to convey his or her own emotional sensibility to the reader, and that the best subjects for poetry are the common incidents and situations of life, especially those of rural and humble people.
Wordsworth also discusses the role of imagination and fancy in poetry, and distinguishes between them. He says that imagination is a creative faculty that modifies and shapes reality, while fancy is a mechanical faculty that merely combines existing images. He asserts that imagination is superior to fancy, and that it is essential for a poet to have a strong and original imagination. He also says that imagination can elevate ordinary objects and events into something sublime and beautiful, and that it can reveal the hidden connections between nature and humanity.
Wordsworth concludes his preface by defending his choice of simple and low subjects for his poems, and by expressing his hope that his poems will have a lasting impact on the readers. He says that he aims to create a class of poetry that is well adapted to interest mankind permanently, and not unimportant in its moral relations. He also says that he writes for a future age, and that he trusts that his poems will be judged by posterity with candor and justice.