For the person who's getting stuck in Zelda, you shouldn't fret. As a general rule, look over every room carefully and use your gadgets. In retrospect, some of the solutions are clever yet ridiculously obvious, so you should not have to rely on FAQs to progress through the game, except for ghost hunting and golden bugs.
Here's a clue which may be a tiny ~~~SPOILER~~~ for non Zelda fans
new gadgets are found in dungeons.