The video is not bad by itself, but there could be many things changed to improve the quality of understanding of this material. For one thing, the speaker, talks a bit fast at times and it makes it hard to follow what he is doing. A text version/transcript of what he is saying would make it much easier to understand. Also, there is no way to enlarge or fullscreen the video, making it hard to see the video at times. Overall, if you are unfamiliar with coding with R, it would be better to look at other resources and be more practical if you find websites that have practice with R-coding software and or look on Youtube and Khan Academy for more examples.