By default, Coda's editor tries to reduce your time spent typing by offering various text completion options to you as you work. These options are context-sensitive, based on your current syntax mode, the text of the document, and the position of your cursor.
For example, in the PHP syntax mode, if you type the word "print", Coda will present a balloon offering possible completions, such as "printf()" or "print_r()"
If you just meant to type "print", simply ignore Coda and keep typing.
To use one of the offered completion options:
To dismiss an unwanted completion balloon:
To change the behavior of autocompletion: