Queen Gohma (Inside the Deku Tree): 
When you enter the boss chamber, look up to spot Queen Gohma on the ceiling. She will drop down to engage you. When her eye turns red, quickly shoot it with the Fairy Slingshot to stun her. While she’s stunned, approach and deliver jump slashes with your sword. Repeat this process until she’s defeated.
King Dodongo (Dodongo’s Cavern):
King Dodongo will inhale deeply before releasing a stream of fire. As he opens his mouth, toss a Bomb or Bomb Flower into it. The explosion will stun him, allowing you to strike with your sword. After recovering, he’ll roll around the room; defend yourself with the Hylian Shield or move to the sides to avoid damage. Repeat the bombing and attacking sequence to defeat him.
Barinade (Inside Jabu-Jabu’s Belly):
Begin by targeting and severing the tentacles attaching Barinade to the ceiling using the Boomerang. Once detached, Barinade will release electrified jellyfish that orbit around it. Use the Boomerang to stun Barinade, then eliminate the surrounding jellyfish. After clearing them, stun Barinade again and attack its main body with your sword. Be cautious of its spinning attacks and electrical discharges.
Phantom Ganon (Forest Temple):
In the first phase, Phantom Ganon will enter paintings and charge toward you. Observe the paintings to identify the real Phantom Ganon (he will emerge from a painting with a brighter glow); shoot him with the Fairy Bow as he exits. After a few hits, the second phase begins, where he floats around the arena, casting energy balls. Deflect these back with your sword until he is stunned, then approach and attack. Repeat until victorious.
Volvagia (Fire Temple):
Volvagia will emerge from one of the lava pits in the arena. Watch for the pit emitting smoke to anticipate where he’ll appear. When he surfaces, quickly strike his head with the Megaton Hammer to stun him, then follow up with sword attacks. Afterward, he’ll fly around, breathing fire or causing rocks to fall from the ceiling. Keep moving to avoid these attacks. Repeat the process until he’s defeated.
Morpha (Water Temple):
Morpha manipulates water to form tentacles aiming to grab and throw you. Use the Longshot to pull the nucleus (the red core) out of the water. Once exposed, attack it with your sword. Positioning yourself in a corner can help avoid being grabbed. Continue this tactic, staying vigilant of the water tentacles, until Morpha is defeated.
Bongo Bongo (Shadow Temple):
Equip the Lens of Truth to see Bongo Bongo’s main body. Begin by stunning both of his hands using the Fairy Bow. Once both hands are incapacitated, use the Lens of Truth to see his eye and shoot it with an arrow to stun him further. While he’s stunned, attack his eye with your sword. Be mindful of the bongo drum platform’s movements, as it can disrupt your aim and balance.
Twinrova (Spirit Temple):
The battle starts against two witches, Koume (fire) and Kotake (ice). Use the Mirror Shield to reflect their respective attacks back at them. After enough hits, they will merge into Twinrova. In this phase, absorb three consecutive attacks of the same element with your Mirror Shield; once charged, release the accumulated energy back at her to stun her, then attack with your sword. Repeat this cycle, ensuring you absorb the same element three times to unleash a powerful counterattack.
Ganondorf (Ganon’s Castle):
Ganondorf will hover and launch energy balls at you. Deflect these back with your sword; this will initiate a volley until one of you gets hit. Once he’s struck by his own attack, quickly shoot him with a Light Arrow to bring him down, then approach and strike with your sword. Be cautious of his ground-pound attack, which sends out shockwaves. Repeat the volleying, stunning, and attacking sequence. After defeating him, escape the collapsing castle with Princess Zelda.
Ganon (Ganon’s Castle Ruins):
Without the Master Sword initially, you’ll need to rely on the Megaton Hammer or other weapons. Ganon will attack with large swords and sweeping motions. Target his head and use Light Arrows to stun him, then roll between his legs to access and attack his tail, his weak point. After a certain point, Princess Zelda will create an opportunity for you to retrieve the Master Sword. Once armed, continue targeting his tail until he is ultimately defeated.