Im really begining to hate this book

Ok, so this book is explaining nothing to me. Here is the instructions from the book. On opposite side is just a picture of what we are supposed to be drawing. Been here 2 hours and nothing so far. My drawing will not fully define for the life of me. There are two dims in the instructions I don't understand. Both involve holding the shift key but it is never explained to me what the shift key is doing....

I'm ready to burn this text book and find a better book that actually Explains to me why I'm doing it. All I feel like I'm doing is being a robot without knowing why...

Thanks. I'm going to go home very soon and pretend I don't have to use this book haha

SolidworksSketching