If you look up the term "electronic flip flop" in a book or Wikipedia, you get an answer that goes something like this: "A flip-flop is an edge-triggered bistable mutivibrator that can assume and store two stable states." If you've never worked with flip-flops before, you have not become smarter by reading this.
In the first part you learn in 12 experiments what a bistable multivibrator is, how it works and how it stores information. These circuits are known as "latches". Then the concept of an edge-triggered circuit is introduced to give you "real" flip-flops.
In the second part (Go on...) you combine in another 6 experiments flip-flops to applications as they are widely used in computer chips, but also in everyday life: counter and shift registers.
Let's go...and have fun...