Tell me about scorecards and yard books. I have difficulties pin pointing the format of those two. I made some research to understand the difference but as you see in this picture it seems like they've put a score card in a yard book.

Also in my circle you can see a black elastic. It seems superfluous to me but I wonder what a user of those think. Is it necessary in a yard book?

I think the best would he for me to buy a standard yardbook and a standard score card and work around those but I'm not sure what to buy. I need cheap but standard size.