As you progress through the game, you may notice that you'll be running out of arrows a lot. Fortunately, there is a little trick you can do that will give a ton of arrows with no cost. All you have to do is find a group of bokoblins riding on horse-back and make sure they have bows. Get their attention, but don't kill them. Once they are aware of your presence, pan the camera up so that you are looking at Link from an overhead view. Now, just stand and collect. The bokoblins will continue to shoot at arrows at you, but will always miss as long as you have the camera in overhead view. You can get a hefty amount of regular arrows doing this with little to no effort and in a short amount of time.
Double your maximum fairies
Fairy fountains will only spawn fairies when the amount of fairies in your inventory is at 2 or less, but when they appear they will not disappear unless you scare them away. This means that if you hold enough fairies in your hands to make the inventory counter go down to 2 then more will spawn in a few seconds, then you just need to put them back in your inventory and collect the others near the fountain. If you drop 1 fairy and hold 5 in your hands so your inventory counter is at 2, after waiting a few seconds 4 more will appear that you can get after you put the fairies in your hands away and rush up to catch the stray one. This will give you 12 instead of 6 as the maximum amount of fairies.
Enhanced weapons, bows and shields
Beat the game once and a star will appear next to your save file. Any weapons, bows and shields that you receive after that point will have a random enhancement such as Durability Up or Attack Up.
Infinite Sprinting (Whistle Sprinting)
Sprinting while holding B will drain stamina, but pressing down on the D-Pad will make you whistle which is not a stamina consuming action. By tapping B over and over while holding down on the D-Pad, you will regain any missing stamina and keep up a running speed. Since you are refilling stamina, this allows for infinite sprinting. This does not apply to any other stamina consuming action.
Refilling your stamina while climbing walls, and climb in the rain
On many wall surfaces, Link can jog for a brief moment before he decides to latch onto the wall and start climbing. By pressing B to let go of the wall and holding a direction that faces the wall, you can make Link move that direction for a short moment, letting him jog a bit and refill your stamina. He will then latch back onto the wall once more. Repeat the process to finish your climb or refill your stamina gauge. Most of these walls are set at most a 70 degree slope, so be careful around very sheer cliff walls. Any higher of a slope and you will fall. You can also use this trick to climb rainy slopes, but use the running animation to climb rather than the actual climbing mechanic.
Skip Blood Moon
If you're tired of the Blood Moon respawning everything you kill, then you are going to love this. On a night where you can see that the Blood Moon is rising, take yourself to any shrine throughout the world and taking care to keep a close watch on your in game time, go in just before midnight. You can either wait until you think it's safe to leave again or just run through the shrine's puzzle and then leave. If enough time has passed the Blood Moon event will not have triggered and you can go about your business without worrying about pesky respawns until then next scheduled Blood Moon event.
Turn rusty items into better items
Take a rusty weapon or shield and find a Rock Octorok (the one that inhales and then spits an exploding rock at you). Drop your item on the ground and it'll suck up the item then glitter for a bit before abruptly spitting a better item out (at a very high speed). Be very mindful of your surroundings (Extreme heat, cliffs) so that you don't lose your new weapon/shield.
Weapons are useful for climate control
Fire swords will increase Link's ambient temperature and Ice swords will decrease Link's ambient temperature. Use this to your advantage when exploring high peaks and hot areas, respectively.