Enter keywords into the search function on the videos page and you will be given options to choose from.
No, you can watch as little or as much of a video as your knowledge and skills require. If a video is long, you can watch a little and come back and watch the rest later.
The videos are different lengths depending on the curriculum objective. The length of each video is displayed to help you manage your time.
Some curriculum objectives have sub-objectives and so the videos are longer to cover them all. We recommend watching in chunks rather than sitting through a lengthy video.