Hi @thechauhan1616,
As mentioned in my previous thread, these videos are complementary videos taken from web development training. From the topic Creating Your First Web Page to Creating Your Functions in JavaScript, there was not video content in the training. I thought these video could be helpful in understanding the concept. If you want you can ignore this video (Do not ignore the text content).
We will adding more videos in the training soon.
Do let me know in case you need further assistance.