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Since you’ve been working with a computer for a while, you already know that you need to first select the text and then choose the formatting.* So all you need to know here is how to do that specifically in InDesign. You’re also accustomed to using a toolbar or a panel to change formatting, so all you need to know is where those are. (Both of these things are explained in Chapter 1).
* Just as in any application, when the insertion point is flashing you can change the formatting specs and what you type next will be in that formatting. For instance, if your next word is to be italic, use the keyboard shortcut to choose italic, then type. When finished with the italic text, hit the same keyboard shortcut again to toggle off italic. Try it!