Website files must be kept in an organized file system to make sure servers and browsers can read them correctly. It's easy to set up your file system: just watch the short video above to see what to do. (Maximize the screen to view).
Step 2 in Web Design: Get your software
You don't need super fancy (and expensive) code programs to write code. All you need is:
...whatever the version of Windows Notepad is on a Mac (sorry, don't have a Mac)
At home: on a Windows computer, Notepad comes already installed, so search for it and you should be able to find it.