This course reviews all the English Verb Tenses by focusing on specific aspects of each type. This includes some pronunciation practice, so you will listen better by knowing what more advanced verb structures sound like.
Also, this builds fluency by getting longer verbs into your mouth muscles, so you can focus on what you want to say, not how you should say it.
There is also a great amount of practice with answers and further study, so you can compare with what is in the course, and what you already know. Reviewing the same information, in different forms, improves recall, and thus your English.
These exercises and overviews can be broken into small, focused parts with easy practice; useful on a train ride, for example, or there is enough information and practice for long periods of deeper study.
For example, if you see blue on the screen I am reading what is there, so follow along and practice. If there is no blue, I am saying the same information that is on the screen, but using different words.
Try just listening. If it is too hard, read first and then listen second. It is designed for you to watch these videos many times to get different practice, until you get full understanding of the content.