This course is designed to give you practical exercises that will expose you to the methods and techniques that compose Hostwriting. Almost all of the lessons in this course contain exercises that you can try. These are methods that I've been exposed to or have developed while working with people one on one through Hostwriting.
Accordingly, it's important to do the exercises! The exercises are where your learning will happen. Imagine reading a book on a new diet or exercise routine, but never making changes in what you purchase at the grocery store, or never attending the gym. If you do the exercises, you will learn new tools and skills that will help you with your writing. If you don't do the exercises, you may enjoy reading through the course materials, but I can't guarantee they'll help you.
That said, you don't have to do all of the exercises in this course. I would recommend that you complete all of the sections until the final section, "Hostwriting Assignments." That section is composed of exercises that you can pick and choose, following your interest. In any case, work at your own pace. Many of the exercises are quite short, so you can even do one or two every so often, at a rhythm that works for you - perhaps every day, or once a week.
I hope Hostwriting becomes a set of tools that you can deploy by yourself as you need them for your own projects.