There are a lot of text editors to chose from. Some are paid, some are free. For this course, you can use any text editor you would like. The free options that I really enjoy using as well are:

Atom
Visual Studio Code

You can always hop on over to Discord and ask fellow students what their favourite Text Editor is!

Finally, you can have a reference for any tools and resources used throughout this course in the open source document contributed by one of your fellow students: https://github.com/zero-to-mastery/complete-web-developer-manual

We even have student generated subtitle files for those students that may not speak english as their first language: https://github.com/zero-to-mastery/zero-to-mastery-captions