There is no sound in this educational video.

There's not enough material!

It was great to learn about the detailed materials that need to be prepared for certification.

There's not enough material! Regarding creating personal information flow charts, it would be nice to have some visual content, but it's mostly text-based, and since it's all familiar content, there wasn't much new knowledge to learn. Also, there seem to be parts that need content verification. The terminology choices also seem to need some review.