Clipping refers to several different ways to make Link stand on tiles without jumping onto them.
As one of the oldest and most commonly used tricks in the game, Wall Clipping allows for the player to clip into solid tiles. Furthermore, it allows for many movement optimizations in the game.
Wall clipping is one of the easiest tricks in the game. Simply walk into the corner of a solid tile. One of two things will happen:
Many glitches and tricks stem from - or are made easier by - wall clipping, such as Evil Genie quick kill, super jumping, and sideways block pushing. More often than not, however, it is used to optimize one's movement.
Left: not wall clipped; right: wall clipped
The amount one can clip into a solid tile with wall clipping is based on the side of the tile in which they are trying to clip into:
Pit clipping allows Link to clip into any tile that is below a pit tile. There are two ways to pit clip.
Buffered pit clipping can be done by bringing up the pause menu (LADX only) or S&Q menu (LA or LADX; much harder as you can't easily buffer the game frame-by-frame with this menu) on the same frame that Link falls into a pit. You know when you've achieved a pit clip if you hear Link's "falling" sound while the menu comes up.
Sometimes you will need to buffer two or more falling animations in order to successfully clip into a tile. This is because Link is positioned too high when the falling animation occurs. In order to avoid this, try to position Link so that he is in between two pit tiles and hold down. Bring up the menu when he gets near the center. This will hopefully maximize his distance south of the center of the pit
Pit clipping with the mushroom is the easiest and most consistent method of pit clipping. Simply jump into a pit and use the mushroom. On the last text box, use the S&Q menu to cancel it. You should end up clipped into the tile below the pit.
You can also bring up the S&Q menu before the text box comes up. This is ideal in LA, however in LADX it can very easily result in the game crashing.
Water clipping has the exact same execution of jesus jumping however, once you see the water splash animation, buffer again and Link will move downwards a few pixels.