In the web development course, I use the Atom Text Editor together with a number of plugins. You can continue using PyCharm to complete the upcoming lessons.
However, if you prefer using the same editor as in the lesson videos, you can download and install the Atom Text Editor here: https://atom.io/
The lessons occasionally mention an Atom plugin. Here you can find the (also optional) list of plugins.
The Chrome browser will feature heavily in website creation and testing. So download a copy of Chrome if you don't already have it: