In The Legend of Zelda: Breath of the Wild, the rupee is the in-game currency used to purchase items and equipment. Here are some ways to earn rupees:
Defeat the enemy: Defeat the enemy is a common way to gain rupees. Enemies usually drop rupees, weapons, and other valuable items.
Explore underground caves and treasure chests: In underground caves and hidden treasure chests all over the world, you can find many rupees and other valuable items.
Complete missions and challenges: There are many missions and challenges in the game, and completing them can earn rupees as a reward.
Sell unwanted items: You can sell unwanted items to merchants, such as herbs, animal meat, gems, and other rare materials. Different merchants may buy items at different prices, so choose the best deal.
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Completing the Trial: The trial is a special challenge activity with a generous reward, including rupees, for completing the trial.