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The first section here is actually your paragraph indent settings. You can indent just the first line to get a classic look, and also indent paragraphs on both the left and right sides.
Next you get into the actual tab settings. Tab stops are how far you jump when you hit the tab key. The default is 36 points, but you can make this more or less. There are four standard kinds of tab stops: left, center, right, and decimal (Figure 3-5). Here’s how each one works:
These are the most common. Press the tab key to jump ahead, and then any text you add grows to the right, just like normal.
Text grows evenly from both sides of the tab stop.
Text grows to the left of the tab stop, as if the paragraph were right-aligned.