Most desktop operating systems have a simple text editor. This is not an Office application such as MS Word or Open Office, but a program that allows editing of plain text files – without formatting options, such as bold or italics. In web programming, we work daily with text files, e.g. programming logic (PHP), styles (CSS) or graphics (SVG). The text editors like Notepad++ for Windows and TextMate for Mac, which often structure the content in color, depending on the file format, offer some comfort.
To edit a file in a text editor, open it in such a program – save it after editing – done. It’s important that complex file formats are not mistakenly typing errors – it’s best to save the original file before you begin editing.