Editing text files on Mac
If you decide to code html or something like it on Mac with TextEdit (text editor included in Mac), don’t do it with TextEdit. Get TextWrangler or some other text editor (some free) to do it. I wanted to create a simple text file on my Mac but TextEdit only allowed me to save the file in either RTF or some other format but not as a text file (.txt). You could force TextEdit to save in .txt format by turning off Rich Text mode (Shift + Command + T). But this obviously isn’t a good solution.
So if you want to learn html or do some other task on your Mac that requires editing a real text file (.txt), get TextWrangler or TextMate. I use TextMate which costs about $50. Well worth it. TextWrangler is free.