Do you label this as ‘mastering’? Please be honest, what can someone learn from this very short video? What will you do when the Time ruler just disappears on a long slide? Like in the included image? What is the functionality of a bookmark? How do you use the timeline for selecting items, which is often the only way to have a correct selection. How do you use the zoom slider?

Sorry, but at least choose a title which fits the content.