What if I don't have a computer? Can I trade options and follow this course on my phone/tablet/Chromebook?

You need to be able to use thinkorswim's desktop application in order to follow along with the tutorials in the course. Although you can use the web app on your tablet/Chromebook or the mobile app on your phone, the interfaces are quite different from the desktop application. For learning purposes, we strongly recommend using the desktop application so that you can follow along exactly with the screen-recorded tutorials inside of ITM.