Rebekah D Luke I have a Chromebook as well! I recommend the Chrome Web extension called Caret-T. To change the file type, all you need to do is save it and put whatever file you want to at the end, such as .html or .css. I am going to be using it for a Beta Nation competition because it has a high quality. I hope this helps! Have fun coding!
The Playground is not just a text editor. It also has the files needed to compile you code in different languages. You won´t be able to compile any code in a text editor.
What language do you want to work with?
A higher quality notepad for big projects I use on Ubuntu is "Visual Studio Code" editor. Perhaps it helps on the future.
I made an Oscars game app for my friends using Notepad++ editor because I wanted to do a quality program on a static page to try to keep it simple. The good thing of a .html file is that you can share it on WhatsApp or any messaging app with your friends and all phones and tablets have a browser that will open that file.
Challenge me on an HTML quiz, anyone who reads this comment. 🙂
Chromebooks aren´t really made for devs. You would much better on Linux or Windows.
However, this article might help you. It has some tools for Chromebooks.