There are literally thousands of drinks that people will not order, and don't even know exist, including bartenders and the author of this site. You will find that most people still tend to order drinks by ingredients rather than by name. For example, you will have someone order a Vodka & Cranberry and not ask for a Cape Cod/ Cape Codder. A customer might ask for a Vodka & Orange Juice instead of a screwdriver.
There are, however, drinks listed that are ordered few and far between as the years go by. As the generations from the 1930's, 40's and 50's move on, certain drinks will go by the wayside, making way for new ones that are popular with today's clientele. It's not necessary to waste time on obsolete drinks. Remember that bartending is not a science. There are many variations of drinks and also the way each bartender makes them. You've probably noticed that when you order the same drink in different establishments some are better (to your taste) than others. It's OK to ask a certain bartender to make them for you or ask a server to ask the bartender. If a bartender does not know a certain drink and you know the ingredients then tell him or her and it will be made.
The drink recipes that have been selected are the most universally accepted and are consistent with the changing times.
As a former bartending school instructor, bartending school owner and author of "BEHIND BARS" (currently being updated and will be available for downloading as an e-book), the following drink pages listed by category will enable you to learn them as they are explained in an easy and fun way. Anyone drinking them will thank you. Those tips really add up!