Hey Zikai,
Thanks for sharing your blog post. Your answers to each question are relevant to the topic and explained and illustrated well. Secondly, I like your edited screencast video at the end of the post, which effectively combines modality and multimedia principle. The video not only uses the principle of multimedia learning but also expresses it with a conversational style, well done! In addition, the added YouTube video serves as an aid to the text as well as an extension to the article, allowing readers to stimulate and deepen their understanding and memory with multimedia objects after reading relevant concepts.
Just one suggestion, perhaps it would be easier for readers to display the questions and answers in different fonts and sizes?
All in all, this is a very useful and informative blog post. Thanks again for sharing!