Two questions. 

1) I'm going fundamentals part one. In chapter 4 with power cords. For a two not power cord such as the ones Zander's is teaching, do you strum just the strings that being used such as strings 5 and 6.  Or do you strum all?  I can't tell in the video. 

2). Should you learn the basics of each lesson and then move in or become a master and then move on. So far I have learned the basic of each lecture but move on to the next lecture set every day or other day. But I do practice the material from all prior lectures daily. 

thanks