The editing area is the place for you to design your characters. Here you can put several kinds of patterns and super patterns. You can find six special guidelines in this area to help you with drawing:
Horizontal and vertical Baseline: the thick gray lines define the horizontal and vertical baseline position of the character. Usually the bottom-left corner of the character is adjusted to the vertical baseline position.
Line Gap: Line gap defines the horizontal baseline position of the character line below. This setting is a global setting to your font. If you drag it to a new position when editing a character, it will change this setting for all the characters.
Advance width: The Advance width line defines the left kerning of the next character. This setting is one of the most important things in creating good working pixel fonts. The advance width value needs to be set up separately for each character you create. This is usually one or two pixels wide from the right edge of the character.
X-Height: X-height indicates the heights of the small letters. Its value is said to be the height of the Latin small letter x. In most cases x-Height does not have an effect on text rendering on monitors, so you can hide and show this line in View menu.
Caps Height: Caps height indicates the height of the capital letters. Its value is said to be the height of the Latin capital letter H. In most cases Caps Height does not have an effect on text rendering on monitors, so you can hide and show this line in View menu.