What you can pick up from a video is a workflow you may not have though of. For example, I don't think beginners have the unix console open logged into the data

What you can pick up from a video is a workflow you may not have though of. For example, I don't think beginners have the unix console open logged into the database, while they have another window with the back end code, and then the developer tools open at the same time so they can debug the flow "end to end" unless they are taught to do so. Sometime they may not think to think: why isn't the data appearing? did that data even get read into the database? Do I have to open the dbase now to see? 5 minutes of watching someone do it can save you years of learning that workflow.