The fastest way to make money is going to the grave yard. Just keep track of the begining ghost and then spawn all the other ghosts by touching the graves(you can not kill these ghosts).
Kill the main ghost from the begining and then all of the others will die

To exit and save your game quickly, press Start on Controller 1 and Up+Start on Controller 2.

You need to be at level 9 to do this trick.
Go to the room that has the staircase to the silver arrow. Kill all the wizrobes. Then when you are going to move the block that opens a staircase, move the block and get hit by a ghost at the same time. Link should get knocked inside of the brick. Go left of down to get out of it.

You can shoot a powerful sword beam if you have all your hearts filled up.

When you first enter Level 1 in the First Quest, immediately leave and re-enter. The locked door will be gone!

I'm not sure what this does or if it works, but start a new file and type ZELDA as a name. (That activates 2nd quest which is essential.) From there find the 4th and 7th dungeons (If your having trouble visit nesmaps.com.) and find the three "Life or Money" screens. Be sure to NOT get any hearts while doing this. I can think of three scenarios 1. Game over 2. Kill screen 3. 0 hearts!!!!!!!!

Enter the name "ZELDA" as the name of your character to change all dungeon layouts, as well as the location of all dungeons and other things.