Here is a puzzle from yesterday’s lesson at the club:
The standard lead (assuming that you choose to lead from that nice heart suit) is the queen of hearts. It asks partner to drop the jack if she has it. The jack fills in a perfect sequence for South, and there is no way in which East can keep cope with it, either from a later heart attack from North or because she is end played in hearts each time she is in. Put some cards on the table and try possible layouts. You will see why the lead of the queen against notrump has become standard from this holding.
Notice that the queen is in bold (from KQT9 on relevant part of your convention card:
