Project 3 Operations and Metrics Analysis

I feel the SQL Learning material is not sufficient on Trainity learning dashboard and no masterclass recordings are there for SQL. Project 2 was easy as I have prior experience with SQL but Project 3 needs more expertise. Share some sources which I can peruse or a way to help. The quality of learning material is very inadequate and the master class recordings are very inconvenient as one cannot rewind/fastforward/increase speed etc.