Hindley hated Heathcliff because his father favored Heathcliff over him ever since Heathcliff first went to Wuthering Heights. They were enemies their entire lives.
Hindley despises Heathcliff because he sees him as competition for his father's love and attention. Hindley also harbors deep-seated jealousy towards Heathcliff due to the latter's close relationship with Catherine and his outsider status as an orphan. Heathcliff's presence threatens Hindley's social status and inheritance as well.
Heathcliff's revenge on Hindley begins by manipulating Hindley's weaknesses, particularly his gambling habits and addiction to alcohol. Heathcliff encourages Hindley's vices, leading to Hindley accumulating substantial debts that ultimately result in him losing Wuthering Heights to Heathcliff in a game of cards.
Hindley did not like Heathcliff mainly because they are rivals. Hindley's father, Mr. Earnshaw, brought Heathcliff home as an orphan, and he loved this orphan more than his own flesh and blood son, Hindley. For this reason Hindley torments Heathcliff endlessly. Heathcliff uses this to his advantage when he forces Hindley to trade horses with him when his horse goes lame. He threatens to tell Mr. Earnshaw how much Hindley harms him if Hindley doesn't trade horses with him. Hope this answers your question.
Hindley intends on killing Heathcliff.
He has been corrupted by Hindley.
Heathcliff executes his revenge on Hindley by taking advantage of Hindley's weaknesses, such as his gambling and drinking habits, to manipulate and control him. Heathcliff also gains ownership of Thrushcross Grange and raises his son, Hareton, to become a servant, depriving Hindley of his rightful inheritance and perpetuating the cycle of revenge.
vindictively
Mr. Earnshaw sends Hindley away to college to separate him from Heathcliff and the ongoing conflicts.
Heathcliff manages to claim Hindley's property, including Wuthering Heights, through financial manipulation and gambling. He lends Hindley money and gains leverage over him when Hindley falls into debt. After Hindley's death, Heathcliff inherits the property through cunning and ruthless tactics, solidifying his hold over Wuthering Heights.
Heathcliff saves Hareton after Hindley accidentally drops him over the banister. Heathcliff catches Hareton just in time to prevent him from falling.
Hindley Earnshaw in "Wuthering Heights" is portrayed as selfish, vindictive, and abusive. He is consumed by jealousy and resentment towards Heathcliff, leading him to mistreat and degrade him at every opportunity. Overall, Hindley is a character defined by his cruelty and inability to find redemption.
Hindley warned Isabella to lock her bedroom door because he was aware of Heathcliff's vengeful nature and did not trust him. He knew that Heathcliff harbored hatred towards him and saw Isabella as a means to seek revenge. Hindley wanted to protect Isabella from any potential harm or mistreatment at the hands of Heathcliff.
Hindley is sent away to school