HT Games
Money Trick
Head to the grotto in Kakariko Village, which is found behind the potion shop, with several bottles. Catch a fish and leave the grotto. Return immediately and fill a second bottle with a fish. Repeat this process to fill all of your bottles. Take these bottles to the beggar in the village, who will pay you 100 rupees for each fish. If you have the Giant's Wallet, you can earn up to 500 rupees in this manner.
Saving Magic
Use your Ocarina to play the "Song of Storms" and quickly whip out the Lens of Truth. If you do it fast enough, the border that surrounds the magic meter will not flash, which will allow you to use the lens without depleting your magic. Once you switch to another item the effect goes away, so repeat this trick any time you need to use the Lens of Truth.
Extra Bottles
Earn extra bottles with another trick. Go find something to catch in your bottle, such as a fairy or bug. In the middle of the swipe press "Start." Pick an item from your inventory that you are willing to part with and equip it in the spot where the bottle was equipped. Restart the action with the "Start" button, and Link will catch the item. You will get an extra bottle through this glitch, and the item you had just equipped will disappear.
Super Deku Stick
Get a Deku Stick that will not break. First equip one of these sticks, which works both as a weapon and a method to light fires. Perform a jumping slash attack by running at an object and pressing "A." If you time it right, your stick will break in half. The half that remains will be stronger than Link's sword and cannot be broken.